Greatly increase the animation speed of sheets: In Mac OS X sheets are those animated drop down boxes (like Save As). This shows you how to change the speed of that animation.
Linksys WRT54G and WRT54GS Hacking: I’ve been tempted to buy one of these just to try out all of these nifty hacks.
Introduction to Data Communications: Free online book. Going over the table of contents, it looks like this covers a pretty broad range of communication mediums. This may turn out to be a nice reference site.
Cross-Column Pull-Out Part Two: Custom Silhouettes: Some impressive page layout using CSS.
Montage-A-Google: Create montages using Google image search (via Jeremy).
Power PostgreSQL: Website for a new book by Josh Berkus and Joe Conway. They also have a PostgreSQL 8.0 Performance Checklist with some good info.
db Tuning: Wiki with info tuning various database systems (PostgreSQL, MySQL, Firebird, Sybase, SQL Server, Oracle, etc).
TikiPro CMS: More wiki software, because you can never have too much 🙂
WordPress Plugins Repository: The place to look for WP plugins. This was officially announced on the WP Dev Blog.
Malicious Software Removal Tool: Another cleanup tool from Microsoft (or who ever they bought to get this).
TextWrangler: From the BBEdit folks, a free text editor for Mac OS X.
How To: Make your own Home Theatre Mac (HTMac): This is just freaking cool. Makes me wish I had a cable box.