Best DS/PSP:
Didnt play any handheld games this year. Although my brother got hooked on Patapon pretty hardcore, i think that came out earlier?
Best 360:
L4D, hands down. I play games for the MP experience and, so far, Valve hasnt let me down. Complaints about the lack of content are invalid, IMO cause of its incredible replay value, and, as is becoming more common in this age of gaming, Valve promises to expand the game further on down the line.
Honorable Mention: GoW2. Fable 2 was a piece of shit. GoWs saving grace was its SP story was actually very good, IMO.
Best PS3:
MGS4. heh, I just got a PS3 and I got both LBP and MGS4. Just started playing MGS4 so I kinda just threw this in there just because. :-p havent played it enough yet to really say yea or nay.
Best DLC:
SSFHD. IMO, this year has been a fucking fantastic year for fighters. I remember a few years ago, when SC3 dropped, people were talking about the death of the genre. Now, I cant think of a time when there was a better selection of fun, well balanced shit to play that came out recently, or will be coming out shortly. SSFHD, while not with out some faults in its menu scheme and bugs, is awesome.