OK, after spending most of the evening mucking about in P6, I eventually found that the key difference between P5 and P6 for this type of shader is in the raybias of the reflect node, so here's the landscape water shader as it should be constructed in P6. Pay particular attention to the raybias setting on the reflect node. The default setting will give you a really horrible effect, so you need to turn it up quite a lot. A skydome is used in this image to give the water something to reflect when it isn't reflecting buildings. If you don't want to use a skydome, then make a sky shader of some sort and plug it into the background input of the reflect node. One of the things to note about this shader is that it makes water which has a mixture of diffuse and reflective qualities. Unlike real water, this stuff has no refraction. I've set it up that way because when you see water in a landscape, you usually see it from a low angle, which means you get lots of reflection and no refraction. I.e. this shader is intended for landscapes - don't use it to fill bath tubs or drinking glasses because it will look silly.

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