The maps are beautiful. I'm a huge fan of this sort of data, and I stare at the US map for way too long. In fact, the other day, I was thinking about how much I'd pay for a world hydrological map that covered my entire wall. I imagine that data would be hard to come by. Also, I like the stream order, but I would be interested in seeing some other measurements of streams depicted. (These would be way more difficult, I think.) What if you did yearly average stream flow? The Atchafalaya, for example, is a distributary of the Mississippi, so it's almost invisible on the US map, but it carries almost as much water as the Columbia. On this map, due to stream order, you can hardly see the Atchafalaya. Still, it is an awesome map. Also, I should note that I bought the US map and the Canadian map. The US map is much better. There's not enough variance in the Canadian stream order to make it really pop as a work of art. The US is super interesting. I still love both, but I love the US map more.