It would be nice if sizes could be standardized in some way that I could have one large landscape monitor flanked by a couple of smaller ones in portrait, without looking lame.

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A series paper size inspired aspect ratios would be amazing.

For those of you who don't know, the ratio of sides on A-series paper (A4, etc) is 1:sqrt(2), which means that if you put together 2 sheets of A4 with the long edges touching, you get the next size up, which would be A3.

Two rotated 19" 1600x900s flanking a 2560x1600 30" monitor looks like your diagram.

I have 2x 17" 1280x1024 and 1x 1920x1080. It's not perfect, but it's a pretty good match to your diagram.

Doesn't it bother you that the color and brightness change from one side of the screen to the other? I've had that problem with every LCD I've tried.

Stop buying TN panels then.