Found! ASP.NET Dynamic Data Documentation
Just to save others from having to drill down a million levels to locate the Dynamic Data online documentation, here's a convenient starting point, Using ASP.NET Dynamic Data. (http://vs2008sp1docs.msdn.microsoft.com/en-us/ms336422.aspx)
I'm digging into Dynamic Data for a short demo at Energize IT in Toronto on Saturday.
BTW, you can download some .NET 3.5 SP1 beta 1 assembly and sample refreshes at http://code.msdn.microsoft.com/dynamicdata/Release/ProjectReleases.aspx?ReleaseId=993 and http://code.msdn.microsoft.com/dynamicdata/Release/ProjectReleases.aspx?ReleaseId=994
Ken