I used this list to teach new web designers. Now, the main site is down so I added it as a reference here.

Adobe Photoshop is used by the most
web designers. With Photoshop you can create everything what you want
from beautiful logo to elegant and modern web design. Design tutorials
helps to understand the basic knowledge about web design and gain
valuable experience.

In this collection, you’ll find over 30 excellent Photoshop tutorials dedicated to web designers. You’ll find a variety of tutorials that
include creating full web page templates, navigation menus, headers, and
content boxes. Here is a compilation of 35 Photoshop Tutorials for Creating Modern Web Design that will help you with designing a professional looking website.

1. Create a Clean and Colorful Web Layout in Photoshop

In this tutorial you’ll see how to create a clean corporate layout in Photoshop.

2. Create a Clean Modern Website Design in Photoshop

Build a complete website design mockup for a fictional design studio,
starting with the creation of the initial layout then moving on to
designing the individual page elements. The result is a modern, crisp
and clean webpage layout ready for coding.

3. How a Simple Layout Can Be Mixed ‘n’ Matched with Patterns, Photos and Backgrounds

It’s pretty amazing how much colour and background can change the
look and feel of a website. In this tutorial you’ll learn how to put
together a quick, simple but effective layout and then create variations
using backgrounds, photos and patterns.

4. Creative Studio Web Page

In this detailed tutorial you will learn how to create impressive layout for Creative Studio.

5. Create a Vibrant Modern Blog Design in Photoshop

This tutorial will cover the process of designing a vibrant and
colourful modern blog layout in Adobe Photoshop. Beginning with a blank
canvas we’ll go through the process of creating the entire structure and
effects from scratch.

6. Corporate WordPress Style Layout

In this tutorial you will learn how to create a corporate wordpress styled layout.

7. Design studio – web page layout

Create a professional design studio layout with easy and detailed instructions.

8. Freelancer portfolio design

Step by step tutorial on how to create a portfolio web layout in Adobe Photoshop CS3.

9. Design studio web page

In this step by step tutorial you will learn how to make professional looking design studio web page layout.

10. Photographer portfolio layout

In this tutorial you’ll discover how to create a nice looking Photographer portfolio layout.

11. Design A Fresh Blog Theme On The 960 Grid

In this tutorial you’ll see you how to mock up a fresh looking blog
theme in Photoshop that is designed to be used within the 960 framework.
This tutorial was designed more for web design theory than Photoshop
technique.

12. Car Layout #4

In this tutorial we’re going to be making a stylish car layout.

13. Creating a Professional Business Layout Using Photoshop

In this tutorial we’ll be recreating a simple and professional website design, a business-themed website template.

14. Web Design Layout #10

In this tutorial you’ll see you how to create a sleek looking web
design layout with simplistic metal feel, with the use of alot of grey
color(s) from scratch.

15. Clean Photo Gallery Website Layout

In this tutorial you will learn how to make a clean photo gallery website layout.

16. How to Create a Clean Web 2.0 Style Web Design in Photoshop

In this Photoshop web design tutorial, you’ll learn, step-by-step,
how to create a stunning and clean web layout. You’ll be using some
basic to intermediate-level techniques to build your very own sleek “Web
2.0? style web design that uses the 960 Grid System.

17. Software Layout #4

In this tutorial you’ll see how to create a sleek looking software layout.

18. Graphic Design Studio Web Layout

Learn how to create an effective and contemporary web layout for your design studio.

19. Business Layout #6

In this tutorial you’ll learn how to create a sleek looking business layout from scratch.

20. Design Studio Layout #2

In this tutorial you will learn how to make a clean layout for your design company.

21. Create a Dark and Sleek Web Layout Using Photoshop

In this Photoshop web design tutorial, we are going to create a
beautiful, dark, and sleek website mock-up centered on an elegant
navigation menu that lends itself easily to CSS background sprites.

22. Design a Sleek Real Estate Website

Learn how to create a sleek, professional real estate theme in just 15 easy steps.

23. Create a webdesign company layout in Photoshop

In this article, we’ll see how to create a modern looking Photoshop design for your web design company.

24. Create a modern blog layout

In this tutorial, you’ll learn to create a modern, clean and classy blog layout in Adobe Photoshop using some basic techniques.

25. Software Layout #5

This tutorial will show you how to  make software layout with a nice wooden texture applied as a background.

26. Design an amazing 3d hosting layout

You will be able to build a professionally looking and competitive
online presence which will be highly evaluated by your customers.

27. Design a creative wordpress theme

In this tutorial you will see how you can create a creative wordpress
theme in Photoshop.  The layout can be done in less than an hour
if you have the right tools on hand.

28. How to Create a Unique Colorful Site Layout

This tutorial will guide you through the process of designing a
professional website with a funky colorful flair. The tutorial features
some great colors, effects and layer styles in which you can use over
and over for future projects.

29. How to Make an Impressive Blog Layout in Photoshop

In this easy to follow web design tutorial, you will learn how to
construct a beautiful, sleek, and professional-level weblog design using
Adobe Photoshop that you can later use for your very own blog theme.

30. Create a Web Layout with 3D Elements using Photoshop

In this web design tutorial, you will discover a way to create a
sleek and professional web page layout that incorporates the 3D Ribbon
design trend, as well as some other captivating 3D elements, using
Photoshop.

31. How to Make a Green & Sleek Web Layout in Photoshop

In this web design tutorial, you’ll learn how to create a beautiful,
green, and sleek layout in Photoshop. You’ll learn popular design
techniques such as creating a 3D ribbon and professional-looking color
gradient effects.

32. Design a Beautiful Website From Scratch

This tutorial will teach you how to create tiny details which make a website design look beautiful.

33. How to Create a Unique WordPress Theme

In this tutorial you’ll learn how to create another creative layout which can be converted very easy in a wordpress theme.

You can use this layout to showcase your portfolio, or to sell your products.

34. Create an Amazing Layout Using Textures

In this tutorial you’ll see how to create an amazing layout using a simple texture, and some layer styles.

35. Creative Design Layout Tutorial

In this tutorial we will learn how to create a creative design layout.