I still don't have an e-book reader, but for those who have, I've just noticed that 3 of my books are now available in kindle format:
Astrobiology: A brief introduction
Life on the Edge
Travels to the Nanoworld
Each available for $ 9.99 via wireless delivery if you have the right kind of hardware. If anybody has checked out one of these, I'd be keen to hear how the format worked for them.