Despite familiarity with Godin's work, I'm still unsure how I feel about this particular response. It'd be great as an individual rejection (we love you, but just don't have the space!), but as a boilerplate reply requires a little suspension of disbelief.
Or maybe that's just because I got this reply not half an hour after sending in my app. :) Zing!
Oh, and Tribes needed way more than one sentence in the acknowledgements mentioning Here Comes Everybody by Clay Shirky. I'd just reread HCE before I picked up Tribes and I kept waiting to see something like "So, every example in the last three chapters and next two chapters came from this excellent book... "