Username or EmailPassword
The chief remaining killer "app" for me under WinXP is printing.
My HP LJ1320nw does nice booklets and such under WinXP.
Under Gentoo, with CUPS, I can print, and the duplexer shows up as an option under CUPS admin, but AbiWord doesn't actually use it (disclaimer: haven't seriously troubleshot yet).
If I can fully utilize the printer via LaTex -> PS, that would be one less reason to ever boot XP...