I talked to Tom Rodgers today on the phone and he told me about this new book by Roger Penrose, apparently not planned for release in the US until 2005, but already available in the UK (that's amazon.co.uk in the link).
It's over 1000 pages.
That's a reality check. If I get it, I'll put it underneath my copy of Misner, Thorne and Wheeler's Gravitation.