Shameless plug: My startup, Semantics3 (http://www.semantics3.com/ http://www.semantics3.com/), is building an vertical based search engine for products data -

Shameless plug: My startup, Semantics3 (http://www.semantics3.com/ http://www.semantics3.com/), is building an vertical based search engine for products data - track product pricing changes, get detailed metadata etc. Our current strategy is to monetize on selling the indexed data as part of a pay-as-you-go api. Later on we plan to build a consumer facing website/search engine, essentially a front-end for our api, once we have moved into building large indexes around people and places (the two other verticals we are targeting)