There's a really interesting new search engine made by Anna Patterson who quit Google in 2006. She plans to keep the technology secret instead of selling it this time. The name of the search engine is Cuil and it's pronounced "cool" if you already didn't figure that out.
For starters, Cuil's search index spans 120 billion Web pages.
3 years ago Google only indexed 8.2 billion Web pages. Anna believes that currently Cuil's index is at least 3 times the size of Google's current one.
If you check out Cuil yourself you can see the unique way it displays web page searches. It's really cool and currently I'm looking to see if they have an images only option similar to Google.