I don't know how I missed this one. This is probably my most favorite VS 2003 add-in to date. Anyone doing database development in .NET is probably using the DSWatch add-in. This add-in lets you select a dataset variable while in the debugger and presents a form with an XML representation of the dataset's data (as well as a datagrid).
Well say goodbye to DSWatch and hello to the XML Visualizer! This add-in rocks! Among the cool features it lets you view the schema of your dataset as well as the row versions. It also works on DataViews or any XML serializable type! Who needs to wait for Whidbey? Get this now!