Mario & Luigi RPG 3 (J), Naruto Shinobi Retsuden II (Sequel to Ninja Destiny but only in japanese so far), Guitar hero on tour: Decades (No grip)
I recommend all of them except GH decades if you haven't got a grip.
Halo 3, CoD5 and Guitar Hero World Tour (XBOX 360)
I recommend Halo 3 for it's replay value and great community and it's a great series.
CoD5 for it's graphics and gameplay and you will NEVER be stuck for finding a game online
GH:WT for it's playability even if you're new competing against a pro, and it has REAL music!!
At the moment I'm working through Exit DS. It's a lot of moving pieces around the screen and if you make a mistake you have to start over, it's not the most exciting game in the world but I love that kind of thing.
And I would be playing Big Bang Mini, but I'm buying it and the release date's been put back a couple of weeks over here.
However, I've recently been playing Big Bang Mini and Retro Game Challenge. A friend also recommended Bangai-O Spirits so I'm gonna stick that on my cart this today.
I'd recommend both the games I mentioned above if one likes classic, arcade-style gaming. I'd also highly recommend Geometry Wars: Galaxies for that same reason (though I haven't played it much lately.)
I highly recommend Retro Game Challenge if you were playing games in the 1980's. This game is a gift to everyone who grew up on the nes. Doesn't matter what genre you like, because it includes many genres. Truly my GOTY choice so far, and its only FEB. LOL "Beer Shower"
Also, I have been playing Dragon Quest IV, and am up to chapter 4. Its a great RPG that actually makes me work for my goals. ie: having to really search for info, and look everywhere to proceed, while sometimes being stumped for hours. I am playing every day so I can be ready for Dragon Quest V. But that might have to wait, because the Fan-translation of DQ III Super Famicom is coming VERY soon. Anyway, some of the post PSX Final Fantasy only people might not like it, but I sure do.
Currently I'm playing (beta testing for psycoblaster) ASH, it's a great game and I like it a lot. I don't understand why it didn't sell well in Japan... it's really good and the graphics are the best ever seen on the DS (believe me! It's got FMV in a quality that seems ps2 quality.. it just amazes me every time I see it).
Also I'm trying out Retro Game Challenge (playing it on the bus to school when I don't have time to test ASH), it's really fun and it brings my memories back to the early 90s (I'm way too young to fully appreciate it, but having started playing consoles in the NES era, I still feel its nostalgia)