Actually Ive just tested it under IE 6 (yes, the version that originally came with Windows XP) but the ctrl and scroll doesnt work in it. Hmm. I know I managed to zoom in on IE before (and Im certain it was that method)
Just tried it in IE8 and it works perfectly but as you said maybe not in IE6. I did think it worked there as well to be honest.
However, under FireFox the zoom-in function works (unless the font thats been typed is ridiculously tiny like some in the first page)
Can't see which bits you are referrring to