Very good How-to from 52tiger.net on how to print from iOS to a non iOS enabled printer. The set up uses a few services but worth the read if you don't have or don't plan to get a iOS enabled printer. Follow the link to see the entire plan.
In Mobile Safari for the iOS devices, such as your iPhone or iPad, you can enter a new url without tapping the x that clears the url field.
If you already have say apple.com open on you iphone and you want to go to newmacuser.com. All you have to do is tap the url bar and start typing. Mobile Safari is smart enough to know that you want a new url and clears the old one for you.