sorry for not having replied to the AirPort Express question. I know 
I read it somewhere, though, but don't seem to be able to find it 
just now. Should happen, but with the loads of mails I receive and 
reply to every day, it's almost unavoidable to loose track of one 
every now and then.

So I'll just answer to the question I remember ;-)

Right now, you can control the Airport Express using Rogue Amoeba's 
software Airfoil. The guys at Rogue Amoeba were even so nice to put 
together a Behaviour for Remote Buddy, so it should work beautifully.

Best regards, 
Felix