Google has released Chrome browser for the iPhone and iPad in its I/O 2012 conference. However a problem is that if you open a link in another app your iPhone will use Safari. If you own a jailbroken device there is a little tweak you can do to bypass this behavior.
BrowserChooser is an application by developer Ryan Petrich, which allows you to switch the default browser between Chrome, Dolphin and more. To install BrowserChooser for free in Cydia tap Manage > Sources > Edit > Add, type rpetri.ch/repo, and search for BrowserChooser. Next go to Settings, tap BrowserChooser and select the browser you want to use. As simple as that!
Chrome is available for download in iTunes.