Powerset

Powerset is a semantic search engine scanning Wikipedia and open
database site, Freebase. The company created an iPhone version of its
site in May after execs realized that a third of its employees owned
iPhones, and they wanted a simpler, faster version of the site for
mobile browsing. Powerset allows users to type in questions such as,
"Who won the NBA Championship in 2008?" Linguistic technology parses
every sentence in a Wikipedia or Freebase entry and provides condensed,
text-based results with links on key search words to the full entries
for further clarification.