Screenshots
Gnumeric
Gnumeric on WinXP
Gnumeric on Win2k
Gimp
BitTorrent on WinXP
BitTorrent on Win2k
Inkscape on WinXP
Inkscape on Win2k
Gaim
X-Chat
Workrave
These are actually shots of an old version of GTK-Wimp running an old version of Workrave. Current GTK-Wimp version have extended support for additional widgets. On a side note, the new Workrave version look much nicer, addressing many HIG issues.
Plain old GTK on Windows 2000
Font too large, wrong shade of gray...