Windows only: Freeware program Avi2Dvd converts AVI video files to ISO files you can burn to DVD, VCD, or SVCD.
If you've ever tried to burn AVI files you've downloaded to DVDs, you probably know that there isn't much in the way of free, simple ways to do it. While Avi2Dvd isn't a one-click solution, it seems to work fairly well; that said, it's still in beta, so you probably shouldn't expect the world. Avi2Dvd is freeware, Windows only. For a bit more help on authoring DVDs, check out our previous call for help.