Thought: Arrington has been touting SSE for over a year, and still, no one has built anything compelling with it:
http://www.crunchnotes.com/?p=54
certainly, the first thing one could do with this is create blog software that allows you to submit comments via SSE. There are a lot of great ideas surrounding bi-directional RSS, I'm surprised no one has done anything with them.
The only thing what I miss is the commenting, I don't want to visit the website just to read and write comments.
Some ideas in this field: - in each rss entry there should be a link to the RSS of the comments. - RSS readers should display them inline. - xml-rpc for blog commenting: http://www.webpronews.com/blogtalk/2007/02/20/xml-rpc-for-blog-comments - each comment should contain the possibility to write a reply (with the help of xml-rpc + a small form) - or the whole thing can be implemented on an email or IM base