Hey I just received my 20 inch imac. Its very beautiful and no fan issue,very quiet. I just orderd some ram from frys electronics (2x512). My only problem is the wires get clunky when you have various input devices (ipod,camrea,digital video camrea, printer and so on).Other then that no complaint. My question is how easy is it to switch OS's. I know we still have a wait ahead but is switching to tiger easy? since no one has tiger, was it easy in previous installments?