iPhone owners are a coveted market. Usually youngish and stocked with disposable cash they are the people every advertiser except the makers of Oops! I Crapped my Pants want to reach. If companies want to reach the iPhone enabled out there then the companies that sell ads want to give those advertisers a way to get their ads in front of iPhone users.

Predictably companies are optimizing ads for the iPhone. one of the first out of the gate? AOL. Platform-A will detect if you’re using an iphone and then serve you up so delicious iPhone only advertising. But AOL isn’t going to stop there, the optimized ads will then (hopefully only if you want to go) redirect your iPhone to sites specifically coded for the iPhone by the marketers.

It all sounds innocuous enough but when I’m using my iPhone I want regular version of the pages, not iPhone specific pages (I’m looking at you Amazon). It is easy to imagine this kind of thing getting out of hand and ruining the web for the iPhone. I haven’t tested it yet but I bet you can get the same experience on your Mac by firing up Safari, hitting Develop in the menubar and changing your user agent to Mobile Safari.
source: Market Watch