Pushit is a marvel within sharing technology. Not only is it capable of sending a of a blog post to a friend via SMS or e-mail, it also gives your blog a universal mobile interface!

As a side-kick, Pushit sends your users their password via SMS, so you will have less problems with spam posts. And yes, there’s a bunch of other features as well… Pushit is currently in closed beta period. You can try Pushit at Handshake.se as an end user, or apply to the beta program as a content provider.
The first public beta is scheduled for 30th of April 2009. After this date, Pushit will be available under the GPL v3 licence from wordpress.org, where you also can find the official FAQ.