I've recently adopted a vegetarian diet and have been enjoying vegan cooking. As much as online recipes are useful there's still nothing quite like a physical cookbook. I have a small collection of recipe books but most are very much centered on the use of animal products and so they are of fairly limited use to me now. I've been looking at the Food Not Bombs books as well as some of the America's Test Kitchen books but I'm curious as to what this community can recommend.
Edit: Thank you for all of the responses! I now have a lot to look into and I apologize for not really being able to respond to all of you individually.
The Wicked Healthy Cookbook is a good choice. I like Derek Sarno (one of the authors) on YouTube too even though his recipes tend to be made for small armies, and he cuts to his dog a few too many times, but every one of his recipes that I've tried has been very good.
Edit - you can also find this Cookbook on Anna's archive or similar websites if you want to try it out.