Like the title says.
Personally, I use
-Notepad
-Excel
-Firefox
-Filezilla
-Quicken
-Outlook Express
most often. Yeah, things aren’t much faster with an A64 rig…but Doom 3 does run a lot smoother. 
My start bar area is like this:-
Mozilla Firefox
Adobe Photoshop CS
DC++
Nero Burning ROM
Notepad
MSN Messenger 7.0
Paint (No idea why I hardly ever use paint)
Cyberlink Power DVD
Microsoft Word 2003
In Windows/Linux
Notepad/KWrite
Paint
Dev-C++
MS Word
Firefox
GAIM (used to be MSN 7.0)
According to my Start Menu it’s:
Mozilla Firefox
Mozilla Thunderbird
Notepad
Windows Media Player
Diablo II
Open Office
aMSN
WinRAR
Doom 3
Firefox
Photoshop 7
Macromedia Dreamweaver MX2004
iTunes (1800 songs now :D)
Steam
Counter strike source
Word 2003
Firefox
Outlook
Notepad
Dreamweaver
MS Word
Media Player Classic
CS - Source
firefox
gimp
Gaim
mplayer