The last of the series of ADO.NET 2.0 articles I commissioned from Bob Beauchemin, Tracing Data Access: A Gentle Introduction to ADO.NET 2.0 Trace Facilities, is live. It covers (just like it says in the title) how to use the new tracing functionality to track down bugs and bottlenecks in your applications. Getting familiar with this will save you big headaches in the future, I guarantee.
And I must say a big thank-you to Bob, who has been great to work with. He's a heck of a technical communicator. If you want to collect the whole set, his previous five ADO.NET 2.0 articles are: