Yep. Well, movies rarely. I mostly watch TV shows and anime series. I used to have an hour and a half to two hours commute to and from work. That's the reason I bought the PSP in the first place. Seems less cumbersome than a portable DVD player or laptop. I've finished a season of TV shows or anime per week or so just watching during my commute.
For some reason the PC keeps me occupied doing who knows what when I'm at home so I never get to watch at home.