The 2nd edition of my last book on gimp, the artist's guide to GIMP, has arrived at No Starch Press and is about to head out to retailers. They're offering a big discount on orders through July 3rd.
You can get info and a code from the following URL:
http://us4.campaign-archive2.com/?u=7f22e9d06dac9fadee60e1e45&id=21a2c0ade2&e=
Hope you find the book helpful!