I got my Pi today and having a lot of fun with it (it's the coolest computer I've owned, and I had a lot of comupters...). I had some problems with mp3 playback though but due to my own fault.
I have installed mpg123 and I can play music ok from the command prompt without having started x I could play music by entering:
However once I started x this only worked if I entered:
sudo mpg123 <mysong>.mp3
I remembered that when renaming the pi user to my user something went wrong and I simply created a new user for myself. This new user did not have the required audio group membership. Once I fixed that mp3 playback worked fine with and without x.
However I do wonder why without beeing in the group audio I could playback music from the command line without the sudo. Does anybody have any idea on this?