these tools/resources will mostly be of interest to Dreamcast/WebTV browser users, though, a few might be worth a look for anyone who works with with web pages...

AnyBrowser.com - Your Source for Browser Compatibility Verification
WDG Copy/Paste HTML Validator
Cynthia Says - Accessibility Validator
Doctor HTML Quality Assessment Validator

Web Pages That Suck -- Daily Sucker
HTMlite tutorials
extended ASCII - Webopedia.com

TL/2 - "a FileManager specially designed for thin-client browsers and a sturdy [webspace tool kit]".
Draac.com - Web Page Tools
MAiP Developer Tools
Domania Directory Mover
net2ftp

Email Address Encoder
Adobe Acrobat - Adobe PDF Conversion by Simple Form

"JSMFeed is a Perl script that converts RSS XML feeds into standard browser side Javascript in JSMsg convention." - "Display RSS Feeds on your site- Convert your RSS feeds to JSMsg feeds for easy web-page display"
"phpMyChat is an easy-to-install, easy-to-use multi-room chat based on PHP and a database, supporting MySQL, PostgreSQL, and ODBC."

and, behold The World's Largest Cylidrical Aquarium...

AquaDom Aquarium [via BoingBoing.net]