I wrote a simple osdx to implement federal search for MSDN on windows 7 . you can click here file to download .
Here is the osdx code,you can modify it and save as msdnsearch.osdx
<?xml version="1.0" encoding="UTF-8"?>
<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/"
>
<ShortName>MSDN Search</ShortName>
<Description>OpenSearch for MSDN via Windows 7 Search Federation.</Description>
<Url type="application/rss+xml" template=" http://social.msdn.microsoft.com/Search/Feed.aspx?query={searchTerms}&locale=en-US&format=RSS"/>
<Url type="text/html" template="http://social.msdn.microsoft.com/Search/en-US/?query={searchTerms}"/>
<LongName>MSDN Web Search</LongName>
<Contact>duanjunyi@live.cn</Contact>
<Image height="16" width="16" type="image/vnd.microsoft.icon">http://blogs.msdn.com/favicon.ico</Image>
<Developer>Duan Junyi</Developer>
<Attribution>
Search data Copyright 2009, Microsoft.com, Inc., All Rights Reserved
</Attribution>
<SyndicationRight>open</SyndicationRight>
<AdultContent>false</AdultContent>
<Language>en-us</Language>
<OutputEncoding>UTF-8</OutputEncoding>
<InputEncoding>UTF-8</InputEncoding>
</OpenSearchDescription>