Well i've been invited to come back to CF United again in 2007 to speak. This year I will be talking about XML and specifically about ColdFusion's built in functions for creating and manipulating XML constructs.
If you are a ColdFusion developer, this really is a fantastic conference and no matter what skill level you are, you always learn a ton of new things.
I personally am looking forward to learning more about integrating CF and Flex 2. For more info and registration info, click the nice picture below.