Since a few friends have been going around posting rather long lists of applications that they seem to find essential, I have decided to list the majority of things on my system (the Windows part of it for now, the rest is just for scientific work).
OS: Windows XP (also Debian and Solaris)
7-Zip (seems to compresspress just about anything I ever need)
GIMP (for image editing)
and a few plug-ins, such as AudioScrobbler
Can't imagine having left anything major out?.....