Has anybody here ever used OpenAL? (Open Audio Library, www.openal.org)

I went to their site...but it confused me...I didnt know what to download or anything....and I couldnt really find any tutorials...

How compatible is it with SDL, and how multiplatform is it? I know it supposedly has the ability to play MP3s...and that is what I want...and it is also supposedly multiplatform just like OpenGL, and I also want that. I want to use it in my SDL programs.

Anybody ever used OpenAL before?