If you spend a lot of time working with XPath, you probably know that it's not as easy as it could be in Visual Studio 2005. Back in July, our local resident XML-guru, Don Demsak (a.k.a. DonXml) released a really cool open-source plug-in to support XPath development in Visual Studio 2005.
Read Don's Intro to XPathmania post to learn more about the plug-in and the functionality it provides. You can get your hands on the actual bits at http://www.xpathmania.org.
Congrats to Don, as he just announced that XPathmania won the Visual Studio Extensibility Plug-In Contest!
For those of you that weren't aware, Visual Studio 2005 is extensible via an SDK that allows you to build plug-ins. You can find out more information about extending Visual Studio here.