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Unfortunately, it's not log based. Just like Google Analytics, you insert a little script in, when request comes in, the script will update MongoDB in the backend.

Though, your need are not unusual, I guess. So, publish it.

I'm interested as well and may contribute

Or you could just install glTail - http://www.fudgie.org which I wrote to do exactly this, with multiple parsers and OpenGL display.

That would be cool. It actually wouldn't be hard to adapt Hummingbird to pull from the logs, or of course you could use another existing WebSockets server to serve the requests. WebSockets is a pretty simple protocol, and Hummingbird just sends short JSON messages over it.