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Thanks for the great post with all the good examples!
Unfortunately, it looks like the PNG fallback makes a request to the server and downloads the PNG, even when the style is overwritten later in the stylesheet. So the payload is the same even for browsers that support RGBA.
In that case, it’s probably better to use IE conditional comments (unfortunately). Or even using CSS filters (_h1 to target IE6, *h1 to target IE7, etc).