Wasn't Anak said to be 9 or 12 cubits tall? Giants by Stephen Quayle is the only other book I know of. There was a book in the 1800s that is out of print that had some old pictures.
There is another of the scrolls discovered at Qumran in 1947 that deals with this, the so-called “Book Of Giants.” It's fragmented which has complicated and deterred or delayed translation, but it has been attempted several times.
http://www.scribd.com/doc/2435494/The-Book-of-Giants-New-Reconstruction
Some of it is quite disturbing, even with the difficulty in reading so many broken segments of text. They really sound like monsters, these beings do, described as corrupted, as bloodthirsty cannibals and as being utterly destructive.