Limewire Pro. Windows. iTunes (Don't like it becuase its an apple product, but its better than everything else) K-Lite Codec Pack
Paint Shop Pro. Been using it since ver.2 or 3, now happy with 8. Corel Draw. Started with v3, now 9. Word and Excel. For everything else, there are alternatives I could use without serious pain so the particular program name is less important.
Firefox, iTunes, putty, WinaXe, frostwire, Microsoft DNS Server for Windows 2000 Server, CdBurnerXP pro, Openoffice.org, TightVNC.
Firefox, VLC (good codec support, but replaceable), Gtalk, Daemon Tools, Alcohol 120% (Nero style app) most of the time I just use what works, but for any windows-based installation daemon tools is a must have (mounts just about any CD image type, even DJ .cue discs) [edit]: for those of you wondering why, its because I hate swapping discs, and the daemonscript plugin allows for easy game CLI mods
-Stepmania. That game is like a drug. -DivX codecs. -BitComet. -Windows Live Messenger. -CCleaner. I could live without it, it just makes cleaning up your computer a hell of a lot easier. -Paint. The godliest of all photo editing programs.