Nice pics btw
Yeah, I managed to squeeze 4 from playing Ridge Racers straight (yes, it was a stress test, and the price to pay for it was a migraine).
I also left a song on repeat as a sort of test as well, got about 11-12 hours from it
As for that 4GB classic memory stick, I might get an adaptor for it actually, 4GB on the go would definately be cool