Pidgin – http://www.pidgin.im
Visual Studio Team System 2008 Team Foundation Server Power Tools http://www.microsoft.com/downloads/details.aspx?FamilyId=FBD14EEA-781F-45A1-8C46-9F6BA2F68BF0&displaylang=en
Default browser changer (from VS) - http://blog.wovs.com/2010/08/make-it-easy-to-change-default-browser.html
Probably the best productivity tool
VLC media player
Google talk
ISO player
Total commander
File backup and sharing
PDF reader
Oh yeah, notepad
Remote computer
GPU information
System information
.Net exception management