The book's finished, the cover's here, and the release date is...
It was going to be March 26th but Apple pushed the iPad release date back so we did the same.
Latest thinking is that there will be an ePub version for iPads and other eBook readers; a PDF version for PC/Mac users and an HTML version for the those that don't want PDF.
We also have a Kindle version but as Kindles don't display colour I'd like to trial that version on a few people first to see if the book still works with greyscale pictures. People who have the 'Kindle for PC' application (free from Amazon) will be able to see the pictures in colour on the PC in a Kindle emulation.
The file sizes aren't too bad. The epub version weighs in at 3Mb, PDF at 4Mb and HTML at 6Mb - which for a book with 75 large colour pics is pretty good.