Selected restaurant guides used by VegCulture.net -
please visit also our country pages! 

VegCulture supports the work of Food Writer Associations -

Food Service Europe
Michelin Guide
Gault Millau
Gayot
Miele Guide
Time Out
Forbes Travel Guide
Frommer’s  (Recommends Happycow and Vegdining)
For Britain especially

The Good Food Guide and Vegetarian Guides

Important guides with user-generated content.

Definitely the best online starting point is

Happycow.nethttp://www.happycow.com/

and in some ways too  TripAdvisor.com

Addittionally usefull could be VegDining.com

Zagat Survey
Additional information at
http://en.wikipedia.org/wiki/Category:Restaurant_guides