iPhoney
Author: Marketcircle.com
More Info: Link

This is not an iPhone application, but It gives developers a pixel-accurate recreation of how sites will look on the iPhone. iPhoney lets developers test iPhone-enabled Web 2.0 applications and compatible web sites, rotate to see websites in both portrait and landscape orientation, show or hide the address bar for full-screen simulation, and simulate the iPhone user agent to test browser redirection scripts. iPhoney is a free download from application’s website. iPhoney requires Mac OS X 10.4.7 or later.