It may have been cancelled, but in the DVD era, any show with a cult following is likely to get a DVD release, even if it was cancelled after only a few episodes were aired. C0-creator Bryan Fuller credits the fans, but I have to think the success of the Firefly DVD set had something to do with it as well.
Fuller also uses to opportunity to praise ABC for pushing Lost and Desperate Housewives from the get go, and to wish Fox had done the same for Wonderfalls.
I only watched a few eps of WF, as watching unfinished stories always depresses me. But it was a very good show. Well written, clever, well cast, quirky. I wish it wasn't cancelled, and I'll probably watch the DVD set at some point.