In the most recent WPF Studio 2009.1 builds, we've integrated with and enhanced Microsoft's open source WPF DataGrid.

The WPF DataGrid (from the WPF Toolkit) comes packed with lots of features and has very active and helpful community forums. Actipro has built two add-ons for the WPF DataGrid and added a variety of samples.
Actipro WPF DataGrid Contrib
The Actipro WPF DataGrid Contrib is an open-source project, which is a collection of DataGrid attached behaviors, commands, and extensions. In addition, we've added the ThemedDataGrid, which is simply a restyled version of the WPF DataGrid. We've tweaked the system themes to look more professional out of the box and added three sharp Office 2007 themes (blue, black, and silver). The themes are also integrated into our Shared Library's ThemeManager, which allows the theme to easily be changed dynamically during runtime.

This project is hosted on CodePlex (http://actipro.codeplex.com) and is freely available for anyone to use. A compiled version of this assembly is included in the WPF Studio installer, so it's easy to get started. We will be continually adding features to Actipro WPF DataGrid Contrib and would love to hear your thoughts and requests.
Actipro Editors/DataGrid Interop
When we released our Editors for WPF product we included two interoperability assemblies, which make it extremely easy to use the Editors' controls in our PropertyGrid for WPF and Ribbon for WPF products. Now Actipro Editors/DataGrid Interop makes using the Editors' controls in the WPF DataGrid just as easy. It includes derivations of DataGridColumn that leverage the Editors' controls and can be added to the DataGrid.Columns collection. Several common properties of the controls are exposed by the DataGridColumn derivations, making it easy to configure.
Columns are included for the following controls:
- BrushEditBox
- ColorEditBox
- DateTimeEditBox
- DoubleEditBox
- GuidEditBox
- Int32EditBox
- Int32RectEditBox
- MaskedTextBox
- PointEditBox
- RectEditBox
- SizeEditBox
- TimeSpanEditBox
- VectorEditBox
This assembly is provided for free to anyone who has a license to the Editors for WPF product.
Summary
The WPF DataGrid is packed full of features, is highly customizable, and is backed by Microsoft and a very active community. The add-ons provided for free by Actipro make using the WPF DataGrid easier. Download WPF Studio today and get started.