You can now download the WinDVD 4 Plugin... Barely tested, so I'll leave that up to you. 
The source code, which is largely based on the PowerDVD plugin, has also been released under the GPL license.
Download
BTW, I had an interesting time getting the following things to work:
- Cycle through angles, languages, subtitles (DVD).
- Cycle through audio channel modes (left/right/both) (VCD).
- Cycle through CD/DVD drives.
I sorta had to do a knuldge for those since WinDVD didn't provide them. I kinda like the cycling stuff since you only need one button for those things.
I'd be interested in knowing if these also work well for you guys.

The source code, which is largely based on the PowerDVD plugin, has also been released under the GPL license.
Download
BTW, I had an interesting time getting the following things to work:
- Cycle through angles, languages, subtitles (DVD).
- Cycle through audio channel modes (left/right/both) (VCD).
- Cycle through CD/DVD drives.
I sorta had to do a knuldge for those since WinDVD didn't provide them. I kinda like the cycling stuff since you only need one button for those things.
