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When it comes to buying or renting major motion pictures on a format for home viewing, the DVD owns the market. You don’t hear much about videotapes anymore, as hard drive–based digital video recorders (DVRs) more or less killed VHS.
Similarly, when it comes to taking movies with you wherever you want to view them, it’s hard to beat the UMD (Universal Media Disc) together with a PSP. Although portable DVD players are popular, they don’t offer anywhere near the portability or functionality of a PSP. You can’t shove one into your pocket unless you have exceptionally large pockets, and you can’t pop out one type of disc and toss in another to switch from passively watching a film to actively partaking in a gaming session.