I never really understood the need for multitouch in the browser:
On Android, i just doubletap on a column with interesting content and the browser zooms in, rearranges text to fit into the screen and it's easily readable. Best part: i can do this while using only one hand. It's probably because i am accustomed to that now, but i think most iphone users are just complaining because the don't know it can be just that simple and easy. It's really that good, imho. It's very rare for me to want to zoom deep into a picture, where i would understand the benefit of multitouch. (In that case +/- controls appear on the screen when you touch it, so it's not really inconvenient). Yet, as the iPhone is also using Webkit, does it support that doubletap? That'd be nice :)
BUT, i can see the benefit on google maps, as there are no predefined areas (text columns) to zoom in, so i'm looking forward to this update :)
Besides, if you didn't know, the european version of the Motorola Droid(Milestone here) has multitouch. I guess it was because of some legal uncertanity that it had never multitouch in the U.S.?