Wow, Matthew, the PowerPoint is groovy. How in the world do you have time to create such a document?
Anyway, I have a machine with XP and use the following:
Word
Excel
PowerPoint (Not anywhere near Matthew's detail)
Outlook
Calendar Creator
GoogleTalk
Sonic (CD burning software)
VPN/Citrix (For working from home)
Flash
VectorWorks/CAD (The theatre I'm at, at present, prefers CAD but I prefer VectorWorks)
Photoshop