Here’s a cool little blogging tool to help spread news of your blog posts from readers to their networks of friends via email, social networks, instant messaging and their blogs – it’s called TellaFriend.
IN essence it’s a little widget that you embed above or below your posts that readers can click to ‘tell a friend’. Here’s a video to describe it.
There are numerous tools out there that do this type of thing but this incorporates a number of services into one. The only thing I’d probably suggest that they add is the ability to include submission to social bookmarking sites like Digg, StumbleUpon etc (think ShareThis (which enables bookmarking and emailing a friend) meets Tell a Friend).