It might help to know a little bit more about the problems you are having.
Also, most of us here run OS X so that could limit any help we can offer.
For me personally, when I first installed my Mini I had a bunch of problems with the headphone jack not remembering that something was plugged in when it would boot/wake. After a recent failed attempt at a FW sound card, I tried it again rather than reinstalling my old M-Audio POS and it has been working fine since the first few days (major ground loop issues while waking, but it cleared up on it's own
).
-dave