Hmm.. My top 5 or so is probably made of PC games. Baldur's Gate II and Starcraft have both eaten up hundreds of hours of my time, and then there's a few others. For the last few months I've been playing Europa Universalis II several hours per day, and before that it was mostly Dwarf Fortress.
I should really put this PC stuff on the hold, and try to finish some console games. =P