IT Administration
www.majorgeeks.com - Lots of utilities to help IT administrators
www.winguides.com - Great tools like TweakUI (enables registry editing even if it has been turned off) and Registry Mechanic for IT administrators
www.bootdisk.com - Startup disks for all versions of Windows and lots of other free advice, tips, and tools for IT administrators
 

Web Master Tools
www.dead-links.com - FREE tool to find dead web links on your web site.
www.netmechanic.com - Free Gifbot tool to optimize GIFs on your web site.  Other great trial and for purchase tools too.
www.bravenet.com - Free web hosting with a lot of great tools.
www.megawebtools.com - Tools for creating and maintaining web sites.

Software Downloads PC
www.sharewaresoft.com - Lots of software for all platforms
www.pocketpcsoft.net - LOTS of software for Pocket PC devices