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Hey Kerry - Just wanted to respond to your last question before I fly the coop ...

You are absolutely right that down-rez'ing by a factor of two ratio ( 1/2, 1/4, 1/8, etc.) used to be a big deal, and the last time I tested this, it now offers only a very slight advantage.  As you have observed, the introduction of higher order polynomial resizing (eg, bicubic vs bilinear) and fractal resizing has almost completely eliminated this as an important consideration.

When up-rez'ing, there was a similar advantage in the past, but even less so than when down-rez'ing.  The errors introduced by the guesswork involved in filling in all the made-up pixels overwhelmed the slight advantage of every N-th pixel landing on exactly an original pixel location if you up-rez only by factors of two.

Cheers,

Tom M