XML Notepad 2007
XML Notepad 2007 allows you to view and edit XML documents. Handy as the new SCOM management packs are in XML format. It allows you to see a tree view of the document as well as the traditional view that you could see in Notepad or IE.
I loaded up the RunAsExecuation.MP.XML management pack that came with RC1 and the tee view helps in seeing how it is structured. At the bottom pane is an error window and that MP has an error so it does not conform to XML standards. Interesting.