About this time last year, the Applications Prototype Lab at ESRI published a presentation tool for ArcGIS 9.2/9.3. That release is discussed here and can be downloaded from the old code gallery here.
Today, the lab released a new version of the presentation tool as an AddIn for ArcGIS 10. This AddIn is similar to the presentation capability recently added to ArcGIS Explorer. The AddIn can be downloaded here from the new code gallery.
The AddIn was developed in C# for .NET 3.5 and utilizes the graphics capabilities of WPF. Full source code is provided with the code gallery download.