I pulled a couple of screenshots off of the current build, so I could talk a bit about how DVD Maker works. The first page that you go to is the "Add pictures and video to the DVD" page, which looks like this:
On this page, you add the content that you want to be on the DVD and choose the order in which you want it to show up on the DVD. You can also set the title of the disc, and choose which dvd burner you want to use (if you have more than one).
This screenshow shows the state with two videos added. You can have as many videos as will fit on the DVD. You can also add pictures, which all get placed into a single slideshow. I'll talk about slideshows in a little more depth later.
Once you've chosen the content, you can then go onto the next page.
There is an obvious bug with toolbar rendering in the screenshot - the toolbar buttons should have the following text: