Processor: 2.4GHz Intel Core 2 Duo
Memory: 4gb ddr3
Graphics: nvidia geoforce 320m

but also have onboard graphics as well.
It's a MacBook Pro, 2 and a half years old, I prefer to play minecraft on the Windows side of my hard drive simply because it handles Java better than OSX. I can play Arma 2 with normal graphics at 28 ish fps, so it's not too too bad.