ID3 info to file names

I have a Wii, and Excite Truck (WICKED game), and an SD card. So, I want to play music on my Wii to replace the crappy music that comes with the game.

Problem is, the Wii reads the filenames, not the ID3 tags, so my 1GB SD card is loaded with a bunch of really sporadicly-organized MP3 files.

Is there a utility I can use (preferably freeware) that will rename MP3s based on the ID3 tag information?