1. Firefox
2. iTunes
3. The GIMP
4. CCleaner
5. VLC Media Player
6. Trillian
7. Chrome
8. Google Earth - I kid you not...it really helped in a project I had on Hiroshima
9. Aegisubs
10. uTorrent
Honorable mentions: 7-Zip, Open Office.org, Winamp,.....and I've gotta check out Steam.