Whoa excellent list
it should be recompiled in the first post and sticked.
I use many of those tools but 2 other more :
Komposer : light and opensource html editor. based on lib mozilla (like firefox and opera). It does not had stupid and useless tag like many other html editor. very powerful to edit simple pages.
TreeSizeFree : show each directory size. very helpful to clean your disk.
Filezilla : the best ftp (and not only) client.
ID3TagIt : excellent software to tag mp3 (convert from and to filename is powerful)
Sketchup : 3D modeler for the dummies
My other favorite, already in the list :
Notepad++,
Visual express edition,
CCleaner,
GoogleTalk,
Unlocker,
TortoiseSVN (ankh is not enough and too intrusive in visual),
Winrar but 7Zip is really powerful too, Fraps, and ...Itunes.... sorry i like itunes even if it is really heavy.