Heh, OatMan.
ChonChon, you're right that games haven't shown a X1900 to be three times as fast as a X1800, even tho it has three times the pixel shader units (not pipelines). In fact, I don't think even synthetic benchmarks have shown a X1900 to be three times as fast, tho I think some have shown well over a 2x improvement. Bottlenecks abound in a video card, so while the X1900 might have 3x the pixel shaders, games aren't yet totally pixel-shader-limited. The reason for that? Well, b/c the X1900 (and X1600, which also has an unusually high number of pixel shaders) isn't quite like previous video cards. Every video card before it has been much more "balanced" between shader operations and texture operations. Well, the GF7 series has beefier pixel shader units than the GF6 series, so you can say the 7800 was the first step in the X1900's direction.
But most games will continue to focus on running best on the most hardware, and for now that's more "balanced" GPUs. ATI probably needs to convince developers to crank the shader usage in order for the X1900 and X1600 to really use all that shader power. They need to shift the bottleneck toward the pixel shading. It remains to be seen if they can do it within the X1900's and X1600's useful life. The shader power of the GPUs in Xbox 360 and PS3 is encouraging, but I don't think we'll see the X1900 scale quite to the level of its pixel shaders (meaning, we won't see it 3x faster than the otherwise identical X1800).
So, yeah, not all useful in current games/benchmarks, but it's a better balance than the X1800, which seems to have too few pixel shaders relative to the 7800.
The meaning of a pipeline is changing relative to, say, a Voodoo 2. Let's just say it's still easiest to just run some benchmarks, but you now have to take into account pixel shader power in addition to texturing "power" and even rendering "power." In that sense, a 7900 may be better balanced than a X1900, at least for current games. We'll find out soon enough, though, and the X1900 is sitting pretty ATM.