Hey, thanks for the tip! I tried out Airfoil and at first glance, it's a very mature and well-made app. But then I encountered some problems. At first, as stated before, there's the latency, almost so high I could count it. I really wonder why this is, because Airport doesn't have any latencyproblems whatsoever (for as far as I can recall).
Then the second problem is sound quality. If I play a song on my MBP and transfer it to my Windows XP system to play it on my 5.1 set, it sounds very flattened, something even a lot of EQing didn't resolve. I played the same song on Winamp on my XP system and it sounded like I had an entire new set of speakers, it sounded great (at least in comparison, hehe).
I think this has to do with compression and bandwidth, but that's just what I think.
Anyone have any ideas/solutions?