waldronate - i agree, it's not esoteric and there would already be significant application already if it were strongly advantaged. i can't help but consider the cases the techniques are applicable even with a small size.. for instance, if i needed to write code to dramatically blur an image today, i'd certainly try a first order lowpass/ "leaky integrator" in each direction before running a 3x3 grid filter for several dozen passes. but that's only because of my erudition.

i'm currently rebuilding my app, perhaps i'll give it a test run to blur a height field