Im a using Vegas 8b and I am becoming more and more impressed by this software.
I'm trying to create a video on dvd (no menus, just one clip) and would like it to loop continuously when played in a regular dvd player. Is it possible to do this in Vegas 8 or DVD Architect 4.5? I had a quick look in Vegas but couldn't find anything. Hopefully someone here can point me in the right direction.

This is done using "End Actions" in DVD Architect.
Double-click the desired media so it shows in the centre screen.
Look in the menu on the right and you should see a tab called End Actions.
Set it so that, at the end of the video, it goes back to itself instead of the menu.
It should now loop until you eject the DVD.
I'm not in front of my Vegas machine right now so I apologize if I got a term incorrect.

This is done using "End Actions" in DVD Architect.
Double-click the desired media so it shows in the centre screen.
Look in the menu on the right and you should see a tab called End Actions.
Set it so that, at the end of the video, it goes back to itself instead of the menu.
It should now loop until you eject the DVD.
I'm not in front of my Vegas machine right now so I apologize if I got a term incorrect.

In DVDA go to the file menu and select "New" and then choose the "single movie" option. The next dialog pops up and tells you to select the media, and then you should be done. You may need to do as is mentioned above and specifically set the media end action (End Action button is on the top right of the DVDA screen).

Thanks guys for your response and advice. Much appreciated.

Will give it a try.