Search in YouTube
Right-click on some selected text and find results in Youtube
Search in The Pirate Bay
Right-click on some selected text and find results in The Pirate Bay
Right-click on some text and find its image with Google image search.
Currency rates on web pages
Play drums on your keyboard (letters only)
Error 404 Wayback Machine
In case of 404 page, checks automatically for an archived copy in the Wayback Machine.
Wikipedia to Google Images
Add a link in Wikipedia web pages to open a new tab with Google image search.