Outside.in claims to do for blogs "what Google Local did for web searches." A cool idea -- give it a location or zip code and it searches for related blogs and postings.
I really like both Twitter and tumblr (twitter.com, tumblr.net). This seems more like Twitter -- a continuously updateable, shareable, social "status stream" that uses images and SMS from your phone. Supports groups.
I can't really explain what this does -- it can take your content and turn it into an RSS feed, XML, JSON, or Flash widget, but it's more than that -- seems like it could be handy.