The ideal multiroom system would be a setup with apple..
For me although, and as you can see, there are some issues.

(non-pronto also, but i feel a need to share )

- Just instal iTunes. (free, simple, no-support)
- Pick up some airport express (E100,00)
- Hook up an Russound D-Class Amp (fixed volume with auto stand-by and Amp
passtrough)
- Pick your iPod (in extension you could jailbreak to disable the home button and
stand-by screen and use the sensor for auto wake up )
- Install Apple remote program
- Choose your music, and your play location.
- Missing: you can only add zone's, you can't turn a zone on or off. Also you
control all the volume's.

My customers want's apple, they beg me for Apple, They scream for Apple.
If somebody got this working. He would be my hero!