I started looking at the MvcContrib grid earlier this week, and it looks promising.
At the Kansas City Developer’s Conference today, Javier Lozano showed a demo using JqGrid.
When I asked Javier about JqGrid, he said I might want to look at Telerik’s ASP.NET MVC Extensions Grid.
Any recommendations would be welcome. (If you can give me a grid comparing the capabilities of each, that would be great ;)