I'm surprised no has mentioned Andre Timmermans update to KinoAmp which just happens to do AC3 format now. With Thomas Milius's IntelDMA module it does make a welcome addition to trying out DVD style VOB files on my Iyonix. Well done to both Thomas and Andre.
I haven't tried in with Geminius though so it may be even better. Also being greedy a DTS module would be a boon.