If you are interested in 408, 508, 608, 0309, 911, 1113 and other Mercedes trucks and Buses, you'll likely see that there isnt much information on the net about them, especially in the US. I'm building a site to pool resources and any useful information:

www.mb309.com

We've got a bunch of scans on there now, and more coming. Feel free to post up any good links or information you know of that should be added!

Thanks,
RYan