I know RPM is no real RPG fort, but I'll ask anyway.
Infinite Undiscovery
(http://img366.imageshack.us/img366/3492/infiniteundiscoveryboxacg6.jpg)
Got this for Christmas, and remembered that I love Tri-Ace games. They just make great adventures. Like last year, when I got Valkyrie Profile 2.
I'm 4 hours in, and probably missed half of all possible quests.
After I'm done, I'm gonna finish the Seraphic Gate, one of the best optional dungeons ever.