Simon Elvery, who created the site, found a lot of interesting patterns:
There are some recurring themes which have emerged as I've been playing with the site during its creation. Among other things, it seems people do rather a lot of searching on the topics of music, religion and relationships.
Sometimes the results are sad, like the people searching for free ebooks on relationships for dummies, and sometimes hopeful like looking for love.
Health is also a recurring theme with the names of medicines, diseases and symptoms appearing over and over again.
{ via Information Aesthetics }