I went to my first SF Tech Meetup today and learned a little bit about widgets.  These are little chunks of content that you can embed in a webpage or blog and e-mail around.  Widget people like to use the word viral.  This seems like a good way to promote your website or your blog.  My favorite widgets were: clearspring which provides a simple way to create and distribute widgets and disqus which provides a blog commenting system (that I might implement here).