Eric Doerr on Windows Live Movie Maker made a post explaining; “that because of advances in the way that we create and use digital video, Microsoft decided to start over from scratch with Windows Live Movie Maker, including revamping the UI to make use of the “ribbon” interface common to Office 2007 applications.”
The new user interface for Windows Live Movie Maker is much simpler than the Windows Movie Maker, perhaps a little too simple according to some comments on the Live Wire post. The “Timeline” is gone from the current beta version, and the commenters are asking for it back.
….according to the blog post:
Meanwhile, the Windows Live Photo Gallery folks had been working on a plug-in SDK for sharing video and photos. We think the lines between photos and video are blurring fast, and we know that our customers use lots of different sharing services, and we think that's cool, too. So, we decided to make the plug-in platform support photos and video and use it in both the Photo Gallery and Movie Maker. We're providing one plug-in for Movie Maker (to Soapbox on MSN Video), but we expect to see most of the sharing sites supported fairly quickly.