Gabriel, you might consider using your position to do things the big search engines can't do.

For example, one-click access to mp3s, pdfs, kindle books, movies, torrents, and the like for download.

That is one of the killer features that propelled Baidu to prominence in China, and of course it's how Youtube got sold for $1.6 billion.

Moreover as long as it's not hosted on your servers, it is a legal gray area.

Google has made Lala into a world-beater by putting it at the top for all kinds of music searches. If you went one step beyond and added a little code that would convert that audio stream into an mp3...or that would convert a Youtube link (with one click) into an mp4...that would be very interesting and useful.