For what it's worth,
Alexlit seems to be up and running now. Still a bit flaky from time to time, and currently it's limited to no more than 5 simultaneous users at a time until Dave Howell finishes rewriting it for a new database back-end (so it might be best to wait for the early morning hours when fewer people would be using it).
But if you're looking for a "Pandora" for e-books, you won't find anything closer than Alexlit.