As posted by Gizmodo:

There are many reasons that you could call the Opera Mini 4 Beta an assault on the iPhone’s Safari browser. New features include:

• Overview mode empowers people to browse their favorite Web sites

• Zooms in and cleanly focuses on the content you want (as seen in Opera’s Wii browser)

• Dynamically changes size of text and images, to read without a lot of scrolling

• A virtual mouse to make it easy to scroll in any direction

Check out the Demo Video, or download from mini.opera.com/beta. Also, this will work on just about any phone including Windows Mobile, Palm, and Blackberry.