Google Search Appliance is the way (Score 1)

GSA is the best way for enterprise search! It crawls, index and servers data. About a concern one of guys reaised above about access control. It authenticate you against the current authentication server (NTLM, Kerberos, LDAP, etc) and only shows you results that you are eligible to see that. Oh wait. There is one hiccup there. Licensing sucks. It is based on number of documents it crawls and after 2 or 3 years you should take back your appliance and buy a new one!