I'm playing with the Windows 7 beta. It includes a DVD Maker program. There is no Movie Maker in the beta, but Windows Live has a Movie Maker beta for download (more Internet/cloud features, but not the same as Movie Maker for XP). The DVD Maker too is limited. You can add movies to a project, adjust a few options (4:3 vs. 16:9, etc.), select a menu style and go. A major problem I have is that many of my movies from my Sony HDD Handycam are short segments. I may have 10 short segments of soccer game, which DVD Maker turns into 10 chapters on the DVD. Thus, when watching the final output on my TV, there is this big wacky pause between scenes. With Movie Maker for XP you can stitch together these segments, provide your own transitions, and select your chapter breaks - but you couldn't write to a DVD.
Adding the ability to write to a DVD in Windows 7 is great, especially for the home user (think PC vs. Mac). Other features are very home/family based. But DVD Maker as it currently stands is but a toy.