http://www.degraeve.com/color-palette/

A simple little plugin does the trick.

I found about it from Photoshop Support

Another nice usability site. This one by Jared M. Spool - http://www.uie.com/.

If you find yourself rebuilding a website, you might be involved with a CRUD report.

It’s a good way to evaluate content.

Bugzilla is a nice open source bug tracking system from the fine folks who brought us FireFox.

Shari Thurow poses these 6 questions to users to determine if a site is easy to navigate.

1. Where are you?
2. Are you in the right place?
3. Where do you want to go?
4. Where have you been?
5. How do you return to pages you have previously visited?
6. What do you want to do?

Read more about search friendly design, usability and navigation.

Is your website legible? Point size, font and color contrast will help.

Also, and this can’t be said enough, knowing who your audience. Use a bigger font for the young and old, be aware of visitors who are color-blind, etc.

Speaking of color contrast.

You don’t want to put a lot of time and money into your site only to lose your visitors.

Here’s a great source for usability - Prioritizing Web Usability.

Find if your site has any dead links.

A good source for how to do a 301 redirect.

What is 301 redirect?

301 redirect is the best method to preserve your current
search engine rankings when redirecting web pages or a web
site. The code “301″ is interpreted as “moved permanently”.
After the code, the URL of the missing or renamed page is
noted, followed by a space, then followed by the new
location or file name. You implement the 301 redirect by
creating a .htaccess file.