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I saw it yesterday but today it shoots back to the auto.search.msn.com/results.asp?
That is the only time I've seen it but maybe they toss it up when people type keywords in the location bar too.
Maybe they are doing the same thing on MSN too from time to time.
Getting referrals from beta.search.msn.com means that the person doing a search on MSN got randomly selected to use the Beta site during the Beta period. When they selected a link, the referrer to your site was MSN Search's beta URL.
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>>>>It's used for testing overture PPC listing.
Can you let us know where you got this information? I don't really agree with you as we are seeing referrals for a site that has no Overture listings for the particular keywords that are being referred from the Beta Search.