The DataList is a powerful and simple to use DataGrid-style control for Silverlight. Like the standard ASP.NET version it is easy to setup, can be bound to many different data sources and the output XAML can be templated to give it the look and feel to suit your Silverlight application.
A demo of the datagrid can be viewed at: www.vectorlight.net/silverlight_net_datalist_datagrid_demo.aspx