It appears that there may be some licensing issues with mp3 on the horizon.  WMA is a Microsoft format and they are happy if you use it because it keeps you tied to Windows.  Argueably, WMA sounds better.  However, most hosting programs use mp3.  I do believe that is about to change however.  We could all switch to flac which has the best sound and is free but I don't see that happening.  So, considering all of that.  I suggest you just get drunk and forget it. 
