I haven't thought about it that much, but I've noticed very high latency using IndexTank recently. Probably a proxying problem or something because it always reports a fast search time even when it isn't. It takes 10 seconds but says 0.02 seconds. You can't search comments at all. No date range support. No stemming.

It'd be cool if they outsourced it to someone like you who would put more time into it.