Harpoon asked me to explain what hacking your DVD is about. First, a little background. First of all, ostensibly to prevent piracy (and no doubt to sell more DVDs), the DVD conglomerate (whatever they're called) divded the world up into six geographical regions. Players configured for, say, region 1, can not play region 2 DVDs. Generally, for people who relocate to a new region, you can switch the region on your player a limited number of times (like 5 or so).
This is a problem for Europeans who purchase/order a lot of their movies from North America. This is also a problem for ex-pats living anywhere, who may want to see their native cinema, but may also want to watch locally-produced DVDs. They obviously can't be switching regions every day or their player would be useless in a week. What's the solution? The multi-region hack.
Basically, using a store-bought universal remote or a PalmPilot running remote control emulation software (that is, not physically opening up your DVD player), you can reconfigure your player to play DVDs from any region. This is handy for those cases I described above. For more information on this process, check out DVD Reviewer.