In my voluminous files, I found an article that listed several guidebooks for traveling vegetarians - maybe available on Amazon which would credit Chowhound with a miniscule portion of the charge - every little helps!
Vegetarian Traveler by Jed and Susan Civic
Europe on 10 salads a Day by Jary Jane and Greg Edwards
The Good Vegetarian Travel Guide by Catherine Mooney
Guide to Ordering Meatless in 197 Countries by Bryan Geon
apparently Time Out guides are a good source too.