Windows Explorer (explorer.exe) 24/7
Azureus - 23 Hours
Firefox 1.5 - 8 Hours or more
Windows Live Messenger and Gtalk - 13 Hours/Yahoo Messenger - 6 Hours
Rest:
Notepad
Windows Media Player/iTunes/BS Player/Media Player Classic/VLC
Visual Studio 2005
Warcraft III : RoC or TFT/ Ultimate Spider-man/ Tomb Raider: Legend
Adobe Photoshop 9.0.1
Limewire
Macromedia products - Dreamweaver and Flash... (Fireworks occasionally)