Disgaea. It's so damn fun I can't stand it. I'm not sure how it's so addicting. All I mostly do is stat and level grind, but it's so entertaining to do so.
I've been playing every single moment I could for five or six months now, and I finnaly am running out of things to do after so long. I've also gotten like 60% of the items. It's gotten to the point that I'm happy with the percent of items I've got.
Baal is like impossible for me to kill, so I need to grind, beat him, and possibly it'll be time to move onto Disgaea 2 for the PSP, and yet more of my life will be lost to the fun of grinding.
I've also played Prinny: Can I be the hero? and it's been quite a harsh game. I knew prinnies were weak, but sheesh.