We've struck this error trying to check-in a file in Visual Studio Team System. You get a very helpful dialog that says "The handle is invalid".
Turns out this is a bug that has been fixed post-Beta3, and bites you when two people have checked out an item. The workaround is to use the Get Latest Version menu-item, merge changes then you should be ok.
See this post in the MSDN Forums for more details.
An Overview of using the FileUpload server control in ASP.NET 2.0.
Jeff is involved in the Team Foundation Server product from Microsoft. His Blog is one I keep an eye on for the latest updates in TFS.
I've asked Chuck if there's any way to get him to visit Adelaide on his Australian visit.
ASP.NET Forums - Tips to get the fast build in VS2005 web projects (It's the .refresh files in the bin folder that are the culprit!)
I noticed this extension for FireFox that adds support for URNs.