Anybody looking in the side panel will notice I am using CoComment. This is a funky liitle gem which allows me to show what I am saying elsewhere here on my own blog (it will show other related comments, but only if the other commentor is using CoCo as well). Given I probably write more on other blogs than my own, I'm pleased that I can have that stuff here as well. Like a lot of things, it was Hugh that that brought it to my attention, and if you visit the site you'll learn more. You need an invite to get the beta, but you can ask for one there, or let me know and I'll send one.
It's definitely a work in progress, and there are still a few blogs it won't work on, but I suspect that a lot of these problems will be fixed soon.