AfterDawn's got some details on a new compression format for DVD's that lets you keep all of the extras, but produces a single file that's only 2-3GB in size. My only question is: is it lossless? I'll definitely be checking this out.

"After a DVD is compressed to one much smaller file, it can be played back on your PC like you would play a normal DVD or you can convert it back to DVD to burn to disc and watch it with a stand-alone DVD player. Currently it requires users to have Microsoft Windows XP, DirectX 9.0, and Windows Media Player 10."