If you read my post about getting rid of legacy ports on enthusiast motherboards, then you're on the same page as to my thoughts on single slot coolers on upper-midrange graphics cards (like the 8800GT/9800GT and the 4850). The problem is that there is no exhausting of the hot air outside the case. The reason is because the manufacturers insist on loading up that single back panel with outputs: almost always a 2xDVI + multi-analog out (on the upper-mid-range cards that is). Now, I understand the dual DVI jacks, and because those two take up so much room, there's no point that using that little extra for exhaust, so they throw on a useless multi-analog out to fill in the space. The reason I say useless is because they often neglect to include the adapter for component out. Even if the adapter is included, component is the "when-all-else-fails" of outputs to TV/Projectors from a computer (S-Video and composite are not even worth mentioning these days).
Again, like with the motherboards, I'm not saying ALL video cards should be legacy free, just some (and eventually, most). So, considering most users are still running a single monitor, replace at least one of the DVIs with a HDMI or Displayport, and drop the analog out, and voila, you have enough room for some exhaust.
Also, Taco Del Mar is yummy.
As for the dual-50mm fan idea, the Youtube video will give a better idea of what I mean, but in theory this design should make SLI/Crossfire setups more practical (for non-full-length cards), as every multi-card setup I've seen with dual-slot coolers leaves very little room for air between the cards (thus the first card runs hotter and louder).
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