BlogTalk Reloaded - the conference is scheduled for Oct 2-3, 2006. It will be held in Vienna, Austria:

http://blogtalk.net/

The conference will address researchers, developers, the community of users, the business and educational world and everyone interested in the phenomenon and the tools of social software.

There is still chance to make a submission with the deadline of April 1, 2006 (Length: 200 to 500 words). http://blogtalk.net/call.html