i'm sure this has to be in the back of the minds of the powers that be.. but seriously. i want this frickin' lens. i absolutely adore my 24-105, and IS is very important to the work i do.. but there are some times that f/4 simply doesn't cut it. i mean, really.. if this lens existed, wouldn't that pretty much complete canon's lineup? i couldn't think of anything else i could possibly want.. unless they magically find a way to create a zoom with a wider aperture than f/2.8..