Here my short resume of my first - and frustrating week:
Tuesday, Wednesday, Thursday: downloaded Raspbmc, got it to work in 30 min; spent the rest of the time trying to get Wifi running with an Edimax-stick. No success.
Friday: changed to OpenElec. Got it up and running in 30 min incl. Wifi. Basically everything on autopilot. especially nice: CEC worked from the start, i could use my tv remote to run the show. great.
But: sound with video, no sound with audio (mp3).
Saturday: research into the audio problem. no solution. downloaded wheezy. installed xbmc. got everything running in two hours. hooking it up to my living room TV I discovered: yes, it works - minus CEC. found no solution.
I might go back to the OpenElec implementation with Wifi. I rarely listen to music anyway.
But need things to be that complicated?