I also *love* the idea of this device. I played with Softbooks (and even wrote some of the code) about 10 years ago. The kindle fixes some of the major problems there but I still can't share my books with others (a *major* problem for me), or Or use my already *large* collection of ebooks (please someone correct me if I'm wrong). That said if they get it working with safari I'm getting one.
Another Linux user (Fedora), I'm sure your numbers are much higher than what you're seeing. May want to check with the major distros and see if they have stats on FF users.