I just jumped back into my playthrough of Pokemon Soul Silver. Not sure if I've mentioned this before, but I've been on-and-off with this game for the past two years -- still haven't beaten it. xD
Recently I've rotated between Super Street Fighter 3D Edition and Metroid Fusion. The first I returned to out of boredom and the second I've never played before until now and love it. My favorite game in the franchise thus far.
Currently I'm rotating between three games. These are Super Street Fighter IV 3D Edition, Metroid Fusion, and Mario Kart 7. At least something to stem boredom until New Super Mario Bros. 2 kicks off the holiday season in gaming.
Just picked up Kingdom Hearts: Birth by Sleep for the PSP. I beat Terra's story, now I have to go visit the same worlds as Aqua, and then Ven. Not sure how I feel about that, even though the stories differ greatly, but I'm loving the game so far! Awesome combat and really explains a lot of blank points in the series.