WiiWare -- One new game this week, Soccer Up, a simple soccer game with 4-player local multiplayer and Mii support. Theres also a free demo version of Gnomz, a Smash Bros.-style fighter that came out in November.
DSiWare -- Three new titles available for the DSi and 3DS. Doodle Fit is a shape-fitting puzzle game. Rytmik Retrobits is a musical tool for creating loops, beats and tracks in a retro-drum machine style. Chronicles of Vampires: Origins is a hidden-object hunt.
3DS eShop -- Two titles arrive exclusively for the 3DS. TETRIS is the black-and-white Game Boy version of this classic puzzle game; it was the Game Boys killer app when it first came out and is still a great game today. WayForwards Mighty Switch Force! is a 2-D sidescrolling platformer/shooter, with puzzle elements, really nice hand-drawn graphics and action from the folks who brought us Shantae and Contra IV.
XBox Live Arcade -- One new game this week: Trine 2 is a sequel to the Finnish side-scrolling fantasy game; the original never came to XBLA but this worthy sequel is a lot of fun, and supports 2-player co-op fighting and puzzle-solving.
PS3 on PSN -- Two new titles. Sonic CD is the Sega CD-specific Sonic the Hedgehog game; its been re-released in recent years on Sonic compilations, but its good to see this overlooked classic available as a stand-alone title. Apples to Apples brings the categorization-based card game to the PS3 and may be a good choice for family holiday gaming.
PSOne Classics -- Well, its something, I guess. Many families may be nostalgia-suckered into buying Ataris PSX "reimagining" of the classic Centipede, but this awkward 3-D version doesnt hold a candle to the original.
Notable on Steam -- Steams holiday sale is in full swing, with a meta-game featuring special bonus achievements in a variety of games. Ive become a big fan of Steams ability to push me to sample and buy indie games I might otherwise have missed, at very reasonable prices.