Just played around with various searches. Nice, but I have noticed it doesn't work with usernames, only with message bodies.
What do you mean ? I hope you understand the website is an actual bitcoin related search and not bitcointalk ? Try searching people related to bitcoin like Gmaxwell you'll see results with their recent mentions/discussions.If you search any random username on bitcointalk without any proper references to bitcoin,I'm sure it won't work.
Same thing which do comes into my mind on where this search engine would be used on hunting bounties which i do say that this is indeed a good tool.Searching up things are quiet fast and informations are really been shown up there but i would like to see the dates to be in ordered starting up on the very recent news because i have observed all are shuffled down.
Bounties are a cancer and will just pollute the global scope of bitcoin search.