I'm guilty of buying console and handheld games (Street Fighter 4, Fire Emblem: Shadow Dragon, Prince of Persia; it's latest incarnation, and many more games come to mind) and never even playing them because World of Warcraft has ruled my life since I started playing the day of its launch (I started when I was 16 and just turned 21 on sunday).
Also, I never finished Okami. ><
Edit:
Every game I have bought since I started playing WoW, with the exception of SSBB and Twilight Princess, I have yet to beat.
Please kill my WoW addiction..I want to play the games I have still in the wrappers..