Its just a semi replacement for Google code search. To be honest, its just something I play with. If something comes from it great, if not im not terribly worried about it.

It's neat, but it's hard to find something unless you can guess what people name their fn and vars for programming domain X

True. I have been using it a lot recently to learn how the Guava and Guice API's work in the real world. So perhaps that's its target market. I also tend to use it when trying to remember how some feature of a language works EG lambdas in python http://searchco.de/?q=lambda+ext%3Apy&cs=on