And while we're on the subject, David Pogue has just done a thorough job of comparing Amazon's and Barnes & Noble's e-book services.

B&N won't introduce a Kindle-like reading device until next year. Meantime you can not only read B&N books on your iPhone, you can read them on your computer--a first for commercial e-book services.

Of course, for many years that service has been available--free--from Project Gutenberg, always on my Top Ten list of 'Net freebies. If you don't always have your computer with you but do have a Palm PDA or Smartphone, there's a free app, called plucker, for reading any of the thousands of free Gutenberg books. Get plucker versions of e-books from the Gutenberg site.