Opera Software has released Opera Mini 4 with several new features for quicker scrolling, navigation and page rendering. The new version also includes optimised features for BlackBerry devices, Landscape Mode and syncing with your computer.
You can also see Opera Mini demo online.
According to Opera Mini FAQ, Opera Mini runs on mobile phones with internet connection and supporting Java mobile applications (most phones made after 2001 support Java applications). I believe it won't run on Apple iPhone or iPod touch.
Data connection may cost extra depending on your mobile plan.
For more detail about Opera Mini, please visit http://www.operamini.com/
UserAgent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US; rv:1.8.1.9) Gecko/20071025 Firefox/2.0.0.9
