Following the discussion (Sam, BlogWorks,...) about how to implement CommentAPI, what (SOAP or XMLRPC) and why, trackback mechanisms, ping back etc. my feeling is that the overall direction will be somewhat like a NNTP network for RSS. All the blogs are simple small NNTP servers that "listens" each other (aka ping back) and provide the feed consumers with the posts (aka rss.xml), who has answered on it's own blog (aka trackback) and who has posted a direct comment. So why they all does not agree to the well proofed NNTP protocol (or similar in SOAP) as the basic and extend it by the RSS spec? Why they all start in the beginning? And each one try to make his solution the best over all and: a bit different than all the others. To be compatible now he starts to implement interface XYZ, because it is yet there and seems to be popular. Next, he also implement YZX... It really looks like that there should be a kind of agreement (may be handled by W3C). This would make the frontend programmers more happy ::no one need two tools that handles RSS (reading, posting):: and all the backend's interoperable.