This Might Bear WatchingMetacritic has a current page for each gaming platform, with recent releases prominently displayed in the center of the page.
In terms of recent releases, take a look at the games with average review scores of 80 and up for each platform:
Chronicles of Riddick: The Assault on Dark Athena (82)
Guitar Hero: Metallica (87)
Resident Evil 5 (85)
Halo Wars (82)
Chronicles of Riddick: The Assault on Dark Athena (81)
Guitar Hero: Metallica (89)
Resident Evil 5 (86)
Comet Crash (86)
MLB 09: The Show (90)
Guitar Hero: Metallica (85)
Pro Evolution Soccer 2009 (86)
Little King's Story (89)
Excitebots Trick Racing (80)
Bonsai Barber (82)
Rune Factory: Frontier (80)
Releases that currently single-platform are in bold.
I complained about the quality of Wii software only a few months ago, but this is a compelling list. Five out of seven of the Wii games are currently exclusives, and PES is an entirely different game on the Wii than on other platforms.
I said last year that the overwhelming install base of the Wii (along with lower development costs) should lead to some interesting, unique games on the platform. Hopefully, this is the leading edge of a wave.