July 17th Presentation
Although the presentation is already done, the powerpoint and code samples I used for a presentation on AJAX custom controls and extenders is available on the Central Penn's .NET user group web site at: http://www.central-penn.net in the downloads section.
The Central Penn .NET user group is a group for the central Pennsylvania that discusses anything .NET related. They have some good speakers at their presentations, so if you get a chance, come on out the third Tuesday of the month. You may catch me presenting again sometime in the future; I am planning on speaking for their Code Camp the first Saturday of December.