Nathan Weinberg reports that http://rjdohnert.blogspot.com/ received an email from Google saying you are not allowed to place the MSN Search box on a BlogSpot blog because "obstructing Google's services from operating efficiently and effectively". The blog has been removed from Google and is now at WordPress. It seems unlikely to me that this is against Google's terms of service for BlogSpot, but it is possible.
PostScript: The story is not true, Google does allow you to have an MSN Search box on a blospot.com site. More information at buzz.blogger.com/2006/03/search-policy.html.
This Year's Premier Digital Marketing Event is #CZLSF
ClickZ Live San Francisco (Aug 11-14) will bring together the industry's leading online marketing practitioners to deliver 4 days of educational sessions and training workshops. From Data-Driven Marketing to Social, Mobile, Display, Search and Email, the comprehensive agenda will help you maximize your marketing efforts and ROI. Register today!