My Favourite Programs ar:

01)  ClarisWorks. 
02)  HELP Read.
03)  GIF Animator.
04)  Photoshop.
05)  Notepad.
06)  Screen Shoot-It.
07)  Netscape Composer.
08)  Outlook Express.
09)  Bobby v3.2.
10)  ZoneAlarm.
11)  AVG Anti-Virus.
12)  AVG Anti-Spyware.
13)  WinZip.
14)  Nero Burning ROM.
15)  SuperBot.
16)  RealPlayer.

To name a few!   

I'm looking forward to the day I can be free of microsoft but until then I use these on XP...

Portable Apps suite http://portableapps.com/
Thunderbird mail
Firefox web browser
VLC media player
Total Commander
Netstumbler
Real VNC remote control
Open office
Adobe Photoshop
Skype/Fring
Nero 7
DVD Decripter
Itunes
Autoroute 2007

My favourite programs are:
1. Hugin (Panorama Tools) & Smartblend
2. XNView & shell extention
3. WinDirStat

My most used programs are:
1. Firefox
2. AVG anti-virus
3. Thunderbird email
4. Foxit Reader
5. Open Office 2
6. 7-Zip
7. Metapad
8. SynchBack
9. The Gimp
10. Picassa
11. Irfanview
12. Restoration

My favourite file: Hosts.txt

That's all I can think of at the moment, K9ine

Personally (in no particular order)

Firefox
Openoffice
The GIMP
Scribus

and on Windows at work

Solidworks 3D CAD
InDesign