Ok - so you've got your avi or folder from maktheripper sitting on your desktop and you want to burn it to a blank dvd or cd?
How about File >> New Burn Folder from the Finder? Then you name the burn folder, open it up, drop in the video_ts folder and click on "Burn"
Alternatively you can slip in your blank - it will ask you want you want to do with it, so you choose "Open Finder" for the Action. Then you drag everything you want into that (for a playable dvd that would be just the video_ts folder) and ejecting it should give you the burn dialogue.
There are other ways such as using the disk utility too.