John Savage's "Models of Computation"

I read in DMAnet that John Savage's book "Models of Computation" is now available here (as PDF) under a Creative Commons license. I have my own traditional paper copy, but it's very nice to see such a comprehensive heavyweight textbook become freely available, and get rescued from the twilight zone of many books (when they remain in copyright but it gets harder and harder to get a copy). Now I can think of a bunch of other books for which this would be nice...