A couple more books to drool over

I picked up and/or pre-ordered a couple of books (Kindle editions, both of them) that I am looking forward to reading as soon as I have cleared the pile of current books and magazines from my desk.  Both books are about or tributes to long-standing Grand Master's of science fiction.

The first is Elizabeth Hull's tribute to Frederik Pohl, Gateways. with stories and essays by just about every major writer in the genre.  The second is the long-awaited authorized biography of Robert A. Heinlein...