How do I make my Blu-ray / DVD / HD-DVD drive multi-region?
If you don't live in the 'land of the free' you can also install DVD43 which decrypts DVDs in the background and shows them to the player as region free.
AnyDVD HD can strip the region codes from (most?) HD and Blu-Ray disks. I do not believe either DVD43 or VLC will do that, I think they only work on DVDs.
Most drives will not let you do this - but you should be able to use a program like VLC to get around the regions in software.