Well my brothers getting a Wii for xmas, but i was wondering would i be able to burn a data DVD +/- RW containing video (.avi) and music (.mp3) to play on the Wii or can it not read them?

Also would i need to 'lock' the disc or will it be fine as it is?
I have a PS3 and i know you burn the data pop it in, copy it/watch it. Erase it. Is this anything like the Wii?

Does it matter if the DVD IS + or -?