I have official (I assume) software that my stepdad bought home from work a couple weeks ago. I ripped a few DVDs and put 'em on my PSP. The software's called um...DVDFab5 and it takes about an hour to an hour and a half depending on how long the runtime is. An hour and a half film works out at about half a gig or just over, I think. The quality was ace! Though it was even better when we put Mamma Mia on my mum's iPod Touch, lolol.