One down...
Well, I finished up a big Datagrid project for a Rent DGG client this week. It, among other things, allowed the user to specify which columns they wanted to include in the grid, and in which order. Here are my prototypes for that part of the project. They also wanted to be able to Sort the grid based on these dynamically created columns, and save all the user preferences to a database, columns to include, their order, and their last sort criteria. Oh, and did I mention that ViewState was disabled, so we had to do a few funky things to get the events to work properly.
Also a big THANKS to Mike Pope of the ASP.NET Team who answered a question for me that indirectly helped us get over the final stumbling block. If you haven't seen it already, Mike and Nikhil's Top Questions about the Datagrid is a must-read article if you're doing anything with Datagrids. The section on dynamically creating columns was very helpful on this project.
Happy Datagridding!