MSN has released the next version of their MSN Search Technical Preview, for a limited time only - go try it out, and be sure to provide feedback via the link on the page:

http://techpreview.search.msn.com/

A few details about this stage of the preview:
There are now more pages in the index than the last version of the preview. The site may be slow at times or you may notice missing or incomplete features; if you notice problems or results that are inappropriate for your search, please tell us what went wrong. - The software supplied in this preview is not formally supported and Microsoft does not provide technical assistance for it.