Robert Scoble links to some more information about the MSN Search API's. There is not an amazing amount of extra information in the linked article, however a figure is mentioned about how many queries that you can do with the API.
I have broken down some of the figures so that you know what they are in comparison to other Free (Not mentioning Ebay) API'sGoogle: 1000 queuries to the Search API per dayYahoo: 5000 queries to each individual API per dayMSN: To be confirmed but it appears to be 10,000 per day [this could be per API or in total]Amazon: 1 query per second = 60 * 60 * 24 = 3600 * 24 = 86,400 per day
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More on MSN Search API's
Paul Kinlan
Lead of Chrome DevRel
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