You can now get RSB blog posts via instant messaging, SMS and other new-fangled ways through Twitter (thanks, Lee, for all your help here). If you're already a Twitter user, just add ReadySteadyBook at http://twitter.com/readysteadybook. If you're not, signing up is nimps (old scouse for "easy"). If you wish to avoid such nonsense, I don't blame you!
Update: I've now also added The Book Depository to Twitter: http://twitter.com/bookdepository.
Update II: And now also BritLitBlogs -- http://twitter.com/britlitblogs.