Paul Robichaux is asking for proposals for Exchange Connections event (spring 2007) on his blog... if you are interested, here is a bit more about it:
"Our goal is to have about 50% coverage of Exchange 2007, Office 2007, and SharePoint 2007 and about 50% on Exchange 2003, Office 2003, and related topics like Live Communications Server, deployment, and security. We're interested in sessions that cover all aspects of Microsoft's communications and collaboration stack: security, development, management, operations, migration, and integration."
For submission process and more details, please go here.
To read more about Exchange Connections event 2006, go here.