MS bought Powerset (and their NLP-type search engine) for $100m in 2008. They also bought Farecast (travel pricing forecasting) for $75-115m in 2008.

Hunch for $80m is a steal, as far as talent acquisitions go.

EDIT: I'm not sure if they were product or talent acquisitions, but does it really matter? All companies listed above obtained state-of-the-art algorithms and the teams that developed them.