Japanese peripheral maker Hori is releasing a mat to be used with Wii Fit. The "Wii Fit Mat" (so clever) is pretty self-explanatory: Put it on the floor, under the Wii Fit Balance Board. We guess it'll help prevent slippage, which so far hasn't been much of a problem. Haven't heard of people flailing wildly into their TVs...

This goes on sale in February for around $US 32. Pricey!
Wii Mat [Famitsu]

Not that the Wii's necessarily short on peripherals, but if you could squeeze room for one more, this'd be it. Hori's Fighting Stick. Previously available in Japan, Gamestop now have a listing for an American release on November 6. Price? USD$50. Which is not too bad considering the imported version is a couple bucks more. Or when you consider there's not a single Wii controller layout that's any good for Street Fighter II.
Hori Wii Digital Arcade Stick [GameStop, via Go Nintendo]