Have you ever seen anything with the ability to graphically compare price date like that over multiple city pairs over a several week period without having to decide how long your stay is or pick a potential departure date in advance?

It's the amount of information in that graph that makes it really exciting to me, not some confusing grid of squares with numbers in them that don't make it clear what you get for that number, or on what airline, without lots of clicking.

But like I said, haven't seen it yet and it ain't ITA. If there's something else with that kind of interface out there point me to it, otherwise this looks intereresting.