I'd like to be the first to request a PortableApps version of the Open Source DVD authoring tool DVD Flick.
Here's a description of what DVD Flick does taken from its site:
DVD Flick aims to be a simple but at the same time powerful DVD Authoring tool. It can take a number of video files stored on your computer and turn them into a DVD that will play back on your DVD player, Media Center or Home Cinema Set. You can add additional custom audio tracks as well as subtitles of your choice.
They have a SourceForge page and there's a great HowTo posted over on Lifehacker for those who'd like to give it a try.
I did my homework first and searched the forums. So far no one has mentioned this promising software. Let me know what you guys think.