Based on the tags from this post.
How much is your site worth?
Very thorough article at Sitepoint covering all aspects of valuing your site if you decided to sell up: The Ultimate Web Site Valuation Guide. [...]
Five things all clients want to know
Accurate list I'd say:Can you deliver what we want, on time and within the budget?Will the site work?Will the site look good?Will the site be easy to [...]
Sharpen your site search function
Here's some top tips from Jeffrey Veen on how to improve your site visitors experience when using your site search : 8 Quick Ways to Fix Your Searc [...]
What a great informative site for anyone interested in electronic music. The site aims "to build the biggest and most comprehensive electronic music [...]
Add OpenSearch to your site in five minutes
If you use a modern browser you'll no doubt be familiar with the built in search box, often situated near the top right of the browser interface. And [...]
Site Vista is a like a Browsercam for HTML Emails - a great idea! [...]
Web Site Grader
I like tools like this Web Site Grader, they're fun... but I take them with a pinch of salt. [...]
Generate Google Site Maps
Here's a PHP script that generates a Google Site Map. [...]
How C.R.A.P is Your Site Design?
Mike Rundle presents four tips for making sure your website design isn't crap. [...]
Yahoo site explorer
Very useful tool, which shows incoming links as well as letting you search any site by typing in the address. [...]