-Use wifi to remote control my main HTPC in the living room
-Be able to program recordings without starting the main client
-Be able to play music in the living room without line of sight
(For example: While having a BBQ be able to play music without going into the living room)
iPiMP does all of this and also has the "nice to have" playing transposed TV streams to the mobile.
My mobile phone is android based and needed 0 apps installed to work.