Duck Duck Go is a search engine based in Valley Forge, Pennsylvania that uses information from crowd-sourced sites (like Wikipedia) to augment traditional results and improve relevancy. Duck Duck Go's results are a mashup of many sources, including Yahoo!Search BOSS, Wikipedia, and its own Web crawler (DuckDuckBot).
It uses data from crowd-sources sites to, among other things, populate "Zero-click Info" boxes, which are red boxes containing topic summaries and related topics above results. Duck Duck Go also offers the ability to show mostly shopping sites or mostly info (non-shopping) sites via search buttons on its homepage. Duck Duck Go was founded by Gabriel Weinberg, a serial entrepreneur whose last venture (The Names Database) was acquired by United Online (NASDAQ:UNTD) in 2006 for $10M.
Gabriel has a B.S. in Physics and an M.S. in Technology and Policy from MIT.
DuckDuckGo.com has been my default search engine of choice for over a year now. They're much better than Google IMHO especially in regards to completely respecting and protecting your privacy.