Where I live, it's very difficult to find restaurants that are remotely vegetarian, let alone full vegetarian or even vegan. It's all about the meat around here and it's all about the seafood. ICK! There is only 3 places where I can find decent things to eat, though I'm very sure they're not vegan at all. Oops, I take that back. One of the places actually does have vegan options (all 2 of them) but who wants the same thing time after time?
But... if a person is willing to go "over the river and through the woods" and actually venture into Tacoma, there are some places to be found. The healthfood store (not a pill and powder shop), has a little cafe in it that has some of the best food around but that's a good 30 miles from me so I don't get to go there that often.
I've also heard that there are some good places in downtown but I don't know where they are (I have an idea, though) and I don't know if they're really good or not. There are also a couple of Mexican restaurants there that have vegetarian options, but those places don't have very good food, so we don't go there that often (for some odd reason, good Mexican food is harder to find than vegan options).
Oh, and Taco Del Mar (fast food) has vegan things which is really nice because it TDMs are just about everywhere. So, it's good in a pinch but not great for all the time dining.
I've heard that there are a ton of really good places in Seattle, but I rarely go into Seattle, so I couldn't tell you.
FishAreCool, put me down as another that would love to see an all-vegan fast food place.