This is something I’ve been begging the developers of RSS Readers to figure out. Could this be what I’ve been looking for?
Unfortunately I don’t know. That’s because it’s a closed beta at this point.
Update: Thanks to reader Alex Morganis - I got an invitation code. I’ll post more once I’ve had time to form an opinion 
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Hi. I'm Brandon. I'm a geek, and I work on Search technology for Windows at Microsoft. This is my blog.
The views expressed within my blog are my own - and are not in any way indicative of those of the company I work for, Microsoft, or it's employees. No warranties or other guarantees will be offered as to the quality of the opinions or anything else offered here.
February 4th, 2006 at 10:33 pm
I got an invitation code earlier today and signed up. It currently supports Blogger, MSN Spaces, MySpace, TypePad, Wordpress and Xanga. You basically fill in the comments form like you normally would, click the CoComment bookmarklet, and then submit the form.
I’ll have to play with it a little more before I can say anything else.
February 5th, 2006 at 7:10 am
I was one of the lucky few who got to test it out :D. See my thoughts on it here. I also posted some codes to access the service (invitation codes).