I can't believe that some people don't have Messages on the dock. I mean, the iPhone is, first and foremost, a phone. I would think everyone would want to most quickly access the main features of a phone... Phone, Messages, Contacts (I access contacts from the Phone app). Next most important I would think is email... as that is a secondary form of communication, and the iPhone is after all, a communication device. Lastly, Apple is known for their iPods, and the iPhone is a derivative of them; So that would also deserve a place on the dock.
Hence my dock: Phone, Mail, Messages, iPod (I'd love to have Phone then Messages, but two green icons together is weird).
Also, a lot of people consume data normally found on the web through specific apps (i.e. using the Facebook app instead of logging into the site on Safari. Wikipedia, News apps, Weather apps, IMDb, eBay, Amazon, etc). Safari really only gets me on forum sites, and a couple select blogs (most of which I could also get apps for, but don't want to bother).