DVD Genie. You know when the apply button goes red? That was my idea = w00t.
Anyway DVD Genie is great for resetting the software region code of dvd players however it can #not bypass teh hardware dvd region code (if DVD genie works fine for you - don't worry about it)
However, some DVDROMS have region protection and therefore cannot play DVDs from different regions, without reducing the number of changes left or making it perminant.
It will also allow you to bypass the new third level of protection introduced in Windows2000, as long as you are not using a player that needs an aspi layer (according to the homepage Cinemaster and PowerDVD should work - not sure about WinDVD)
DVD Genie partially works with the new WinDVD 4 - ie the reset region, however the rest does not, however you can get WinDVD tweaker now from http://3dgamer.tripod.com
Basically if you can watch DVDs from any region now, don't worry about DVD Region killer, its for those with RPC-2 (region locked) drives.