What about all that region 1 and region 2 crap etc.? I'm not an expert on regional dvds... maybe a DVD from anywhere can play on my PC DVD player? 
It's no longer really an issue. Region free players have been widely available for some time and they generally don't cost any more than the region locked ones. I bought a region free one from Argos just before Xmas for £15.
Even if a player is not region free out of the box many can be made region free by entering a special code. As a matter of principle I would never buy a region locked DVD player.
Anyway, even if you've already got a region locked player you can always burn a copy of the DVD with the region lock removed.