General
JeroenWiJering Flash Video Player
FireBug -- HTML/CSS debugging tool for FireFox
FireFTP -- FTP client add-on to FireFox
FireShot -- AddOn to FireFox for webpage capture and annotation
RapidShare.com -- one click fileshare
YouSendIt.com -- send large files
Pixta -- Secure File Upload service
WhatTheFont upload image and it will tell you what font that is
Page Strength Tool on SeoMoz.org
skrbl.com -- online whiteboard
ImageVuex.com -- flash gallery with admin control
i2photo.net -- free photo and image hosting
WinMerge.org -- file diff and comparison tool
PHPAdsNew -- open source ad server
XML for Script
XML Parsing in Javascript
Accessibility Color Constrast Tool
MarketLeap
Includes link popularity checker, keyword verification, etc.
Keyword Tools
Overture Keyword Selector Tool
WordTracker -- free and no captcha
Host/Site checkers
Browser Screen Captures
BrowserCam -- paid browser test service
SiteVista -- another paid service
BrowsrCamp -- Safari Screen capture for free
IE Capture -- browser screen capture using IE7
iCapture Safari Screen Capture for Free
NetRenderer -- IE versions screen captures
evolt.org -- download stand-alone versions of IE
Validators
WatchFire Accessibility Validator
Color Tools
ColourLovers.com Color palettes
MeyerWeb Color Blend
Given two colors, it will give you the midpoint or any other division.
Color Match
Simple and easy to use
WellStyled Color Scheme Generator
Pick analogous and comlementary color schemes.
Online Color Schemer and Color Schemer
DesignMeltdown example layouts and color schemes
Music Loops
BeatSuite.com - Royalty Free Production Music Library
Content Management Systems
Chat Software
XooChat.com -- web-based live chat
Web Phones
File Comparison
Online Backup
Mozy.com -- free version available
Domain Tools
DomainDossier at CentralOps.net
WYSIWYG Editor
