Webdoc is a a cool new (beta) site for creating multimedia type blog posts w/ comments. A neat little twist w/ webdoc's is that the comments that others leave are in a webdoc format. This means that a person can create their own little multimedia blog to respond to a post. Another nice feature is the ability to embed a webdoc into your site/blog.
Below is their demo video...
I highly recommend checking out Webdoc by clicking here!!
Thanks to the wonderful, Free Technology 4 Teachers for the tip.