Some css, javascript, and xml links

CSS Zen Garden - Some really beautiful layouts illustrating the power of CSS to totally change the character of a page

StrangeBanana - Randomly generated CSS layouts, good for helping you get ideas

Nifty Corners: rounded corners without images - How to give things in your page rounded corners using CSS alone

Modifying Styles - how to use javascript to modify your css files

cssQuery - a javascript method that lets you select html tags in the document using CSS selectors

Unobtrusive show/hide behaviour reloaded - using javascript vs. css to show and hide parts of your page (I'm not sure the caveats still apply, since the article is 2 years old, but it's worth looking at anyway)

String Matching and Replacing with JavaScript 1.2 - Very helpful for Javascript form validation, uses Perl regular expressions (which are explained within the page). The original page is gone now, but thank heavens for archive.org!

Javascript form validation - Doing it right - Suggestions on how to integrate javascript form validation into your web application in a user- and database-friendly way

Forms, Usability, and the W3C DOM - Using the html document object model to create forms that are more user-friendly

Very Dynamic Web Interfaces - loading xml files with javascript (plus some php)