As well as MSN releasing their Search API's, MSN's own start.com has also released an API, which I think is built with the ATLAS framework that Microsoft are trying to get ready for the release of ASP.net v2.
Why do I say ATLAS? because over on http://start.com/developer/default.htm
, you will see a link to an ATLAS runtime overview http://start.com/developer/atlasruntime.aspx
One thing I have noticed from the "Getting Started" is that you need to enable cross domain data sources in Internet Explorer, whichI have already talked about in an earlier post [here
I need to look in to this too :) I am going to have a busy weekend!