Paul Allen’s AI2 launches search engine designed specifically for scientists

This is really nice. It's fast and gives good results (I mainly searched for some cryptography topics that I've been learning about recently), and the faceted search (filtering by publication venue, author, etc.) is very well done.

The article focuses on filtering, which honestly doesn't sound that impressive.

Something I really need is a way to search articles that talks about the subject I'm looking for, but uses completely different key-words to describe that subject.