Michael's Mac
Is a site with lots of little Mac GUI things - desktops, icons, little hints, etc.
jschilling.net
This site has some really cool (although a tad pointless - like MacLampsX) Mac freeware, although it ends up being updated even less often than my site is these days.
The Iconfactory
A site with lots of absolutely awesome icons.
The Mozilla Project
Mozilla is an open source internet browser. If you've heard of FireFox, it's actually developed under the Mozilla Project, along with a host of other little things (including my favorite browser - a Cocoa version of the Gecko engine, called Camino).
Pimp My Camino
Speaking of Camino, this is a great site with lots of resources/graphics/mods for Camino. My favorites are a couple of the bookmarklets they have, which are real gems - like the one to toggle CSS stylesheets, and the one to show the modification date for the page.
Craig's List
is a site to help you barter (or buy/sell) with people in your area. Electronics, goods, services, pearls of wisdom... whatever.