Snapshots non text content. PDF, Word, Excel, Flash etc.
Deepweb is still pretty much unaccesible to the search engine.
Negative reviews of a business would increase the search rank, this problem has been fixed.
I'm feeling lucky costs Google $110 million/annum. 
Special features: weather, US zipcode, calculations, time, numeric ranges, map, movie showtime, public data, real estate and housing, travel data/airports, package tracking, patent numbers, area code, synonym search and others.