Also yesterday, Microsoft announced Microsoft Search Server 2008 (MSS) and Microsoft Search Server 2008 Express (MSS Express), which will RTM in H1 of 2008.  

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The new MSS and MSS  Express products are our offerings for the standalone search solution market, and were developed for customers looking only for search functionality.

The MSS Express is a free, downloadable, standalone search server while MSS, which can scale to multiple boxes, has a VL SKU.

Go to the http://www.microsoft.com/enterprisesearch/ to learn about the products.