The way they did the OpenSearch description document is wrong and doesn't work in IE either.
http://www.opensearch.org/Specifications/OpenSearch/1.1#The_.22Url.22_element
C9, fix this in http://channel9.msdn.com/searchxml.ashx
<Url type="text/html" template="http://channel9.msdn.com/Search/?Term={searchTerms}" />
Also, whlie editing this post, when I saved, a different post I didn't write was in its place, but my post came back when I tried to edit it again.