The M3i Zero is a backward compatible card with the DS and DS Lite, so even if you don't have a DSi its still going to work!
09/07/09 - Solderless modchip prices where adjusted again. Its now really really cheap to mod your wii yourself. So much so that you don't even have an excuse not to buy one!
We now also (thanks to CC Comms) have a 10 minute video on how to install they Drivekey, a process that takes 10 seconds once the wii is open. 10 seconds explained in 10 minutes means you can't stuff it up!