http://www.myelin.co.nz/post/2003/12/16/#200312161 has a post on
Prototype of a way to make weblog polling way more efficient. This is an excellent article about a new way to discover which blog post a new article. I tested the telnet topicexchange.com 9123 and it’s work fine :)
Perhaps IAggregator need to support this ? stay tunned ..