Adelaide company, Hyperfocal Design, is the host for a growing HDRI & CG community and also a developer of quality textures for graphics professionals. Their high quality texture sets have been used by companies like DICE (Battlefield 2) and Pendulum Studios (LA Rush).
Their website is also a great resource for all things HDRI, with lots of articles, reviews, and a forum related to the subject. The latest article up on their site is a book review of "High Dynamic Range Imaging"...
"Finally we have the first book on High Dynamic Range Imaging or "HDRI". With a very general title like this you might be left wondering what is exactly covered within this book, and this review will help to answer that question.It?s surprising that this is the first book on HDRI - the technique of shooting HDRIs and using it to achieve photorealistic results has been an indispensable tool in the film and computer graphics industry for years. Recently many software developers have integrated HDRI support into their software making it even easier than before to use this advanced technique. We even have HDRI capable cameras and real-time HDRI appearing in computer games. So for people wishing to break into this field, this book is long overdue."
Be sure to check out the review and all the other articles there, and bookmark the site for your texture and HDRI needs :)