there is a new freeware on sourceforge called DVDStyler
Use its "file explorer" and drag the 3 AVI onto the "project window". That will give you 3 titles on the DVD. SHIFT + Drag gives you 3 chapters.
Program handles converting content to DVD format, etc
There is some customization features, such as Menu style, Chapter splitting (auto every 5, 10 etc mins or enter the times manually)
It's somewhat basic, but gets the job done if you have a movie in AVI, WMV etc ... and want to make it a DVD to watch on a TV