alright, first:
zone 0: can read any DVD regardless of its zone
zone 1: USA, canada
zone 2: western europe, japan, south africa
zone 3: south-east asia
zone 4: australia, south america
zone 5: russia, eastern europe, africa
zone 6: china
that put aside, it's very easy to turn most of the DVD drives into zone 0 drives, or "dezone" them.
For pc Dvddrives, you just have to find the correct bios
For the TV DVD drives, t depends, but most can be dezoned after pushing some of the keys in a certain order ( yeah, like a cheatcode

).
Dezoned mine in a couple minutes, and now I can read anything on my DVD drive, mwahahaha

edit: most retaillers will dezone the drive themselves in the store if you ask them.