Comet -- An App.Net Backed Comment System for Blogs
I've been wanting something like this for a long time. Thank you, Alex Kessinger, a.k.a. @voidfiles for coding this up.
As he says, it's rough around the edges, but as someone who believes in what app.net can and should become, this is a beautiful development indeed! Once the rough edges get sanded off, I plan to replace Disqus with this system, but in the meantime, you can test it below if you have an app.net account.