I'm totally hooked on the new WoW achievement system, and it's motivating me to go check out old content. I'm a sucker for checklists - I'm a completionist (part of being a Bartle Explorer?), and I feel a strong urge to try and get every item or thing that I think is feasible.
I've set up the feed from Rupture for WoW, which should update achievements and PvP successes (I think).