You can browse the most-searched queries on Google Hot Trends using search results from Bing. This Google Trends + Bing mashup displays web pages, news results, images and video search results in one page.
I compared site traffic data from Google Trends with the actual statistics recorded by Google Analytics and the results were very surprising.
Google Trends suggests that blogs are now more popular than magazines and newspapers on the internet.
Facebook Lexicon is like Google Trends - it lets you compare how frequently some particular words and phrases are written on Facebook over time. It uses stuff posted on Facebook Walls, events and profiles.