Just a smart tip i've found, if you're not sure your SDHC card will work on not on your Wii, grab a USB SDHC card reader (check on Ebay, you can find some for less than 1$ with free shipping!) and put any kind of SD/SDHC card in it, it works like a USB flash drive! So you can play videos off your SD card with MplayerWii, put homebrews on it and much more!
i tried it with a Kingston 16gb SDHC Class 4 and it works fine.
