Ok, but there are other factors in play. The guitars span four different consoles and every other peripheral on the list is single console. So while the balance board may be a bit more important on the Wii, it has absolutely no bearing on PS2, 360 or PS3 gaming. Secondly, the guitar controller is pretty much mandatory in the games it's featured in, and every other peripheral so far is mainly used in a smaller, optional role. So while the Balance Board may have the guitar in sheer numbers, the functionality of the guitar is more important to the games it's featured in than any of the other peripherals are so far. How many of the 33 balance board games require or heavily depend on the balance board to operate?

To answer your last question... I don't know, probably barely any of them.

Yeah if you count each guitar game on each console, you'd pass 33 by now, and if you're talking about the controllers being absolutely necessary, the guitar controllers win because I think most Balance Board games use it optionally.

But if you're talking about the controllers being absolutely necessary, but not counting guitar games 4 times each for being multiplat, I think Wii MotionPlus might take the cake from the B-Board.  You sure as hell can't play Wii Sports Resort without it.

Balance board will have the most games that can use it
WM+ will have the most games that require it
WVS will have the best games :P (all it needs is Eternal darkness 2 and that would beat the game lineups of all others combined)

@scottie, your avatar is the best thing on the internet.

Cheers. I laughed so much when I saw it

I'm not talking about counting each port of the rhythm games. I'm talking about understanding that while the BB is important on the Wii, the guitar controllers are an important part of the makeup of four different consoles, and in the case of the Wii and PS2, are especially important as far as third party titles are concerned.

Regarding Motion Plus, you may be right in the future, but I feel we're going to get more along the lines of an optional upgrade in the game like we've seen thus far in every Motion Plus game not named Wii Sports Resort. However, as M+ takes off and rhythm games taper off eventually, I can see it being a far more important peripheral a few years from now. Definitely not the Balance Board though. Outside of a few games that really understand the peripheral, it'll be relegated to a parlor trick in games that neither require it, nor use it particularly well in those short instances you can use one.