Opera released a Beta (or is it Alpha) of Opera 10 browser for Maemo and it supports N900 from the start.

"This Maemo version of Opera Mobile 10 was created as a hobby project by a small team of developers in their spare time. In total, about 6 man-weeks were spent on creating the release. It’s worth pointing out that this is not an officially-supported release. As such, it has not undergone our usual quality assurance processes, and at times may not feel as polished or complete as an official release. This also means that there may never be a “final” release of Opera Mobile 10 for Maemo devices, since it’s just that much more fun to add shiny new features rather than fixing boring old bugs."

here is the official description for the Opera Browser:

A first-class mobile Web experience

 

Experience the Web on your mobile phone like you never thought possible. A clean, simple and elegant user experience is available for you, no matter what phone you have.

 

Opera provides a brand-new look and feel in a class of its own with smooth animations and visually appealing graphics. The Opera rendering engine displays complete Web pages, just like on your computer, and is fully standards-compliant.

  

Switching between open Web pages is a snap with tabs, and Speed Dial launches your favorite Web sites with a single click.

 

Opera’s well-designed user interface has you navigating gracefully and efficiently on both touchscreen and keypad devices. The browser comfortably adjusts to your needs by switching between portrait and landscape mode and also lets you adjust the font size for easier reading.

according to Opera, the browser is not ready yet and there are a few issues known already listed below:

• - Adobe Flash and other plugins are not supported
•  
• - Screen tearing may be visible when panning, especially in portrait mode. We expect to fix this in a future update
•  
• - The built-in on-screen keyboard is not supported. Use the physical keyboard or the on screen keyboard included with Opera Mobile
•  
• - There is no power management support. In practice this means that if you open a page with animations and leave Opera running, you will soon be using a payphone. Power is drained even when Opera is running in the background and/or the screen is turned off
•  
•     - If you set Opera as the default browser, for example by installing the Browser Switchboard, an extra empty tab will get opened every time you open a link from an external application

to install the Opera Mini 10 on N900, you should click here.

or with your App Manager:

if you cannot save any settings, here is a workaround for the settings saving problem:

you need: xterm (rootsh)

//1. login as root

sudo gainroot

 //2. grant users as owners

chown -R user:users /home/user/.opera

for more informations go to the official opera forum thread about it and read the official blog post.