Opera has released a beta of the latest version of their Opera Mobile (not the java Opera Mini) for Symbian S60, and this release is valid for both 3rd and 5th edition devices.
Opera Mobile beta 10 claims to be “faster at rendering pages, zooming, panning and almost everything else you do with a browser. Page downloading is now 50% faster than the previous version of Opera for Symbian/S60 phones.”
In addition, it inlcudes speed dial, tabbed browsing, Opera Turbo, password manager, touch & keypad (for 5th edition devices), adaptive zooming, and AJAX support, among others.
Some screenshots of Opera Mobile running on the Nokia E90: