10 Features You’ll Find Only In Opera

Pretty good explanation why Opera is innovative browser.
Русский перевод.
In short:

1. Duplicate this tab
2. Go to URL
3. Reload every 30 seconds
4. Fit to window width
5. Rewind
6. Nicknames for collections of sites
7. Tab closing
8. Instant back
9. Page zoom
10. Crash recovery
11. if you want pages to load faster, you can load only cached images
12. you can control the browser with voice commands
13. use mouse gestures (you can go back this way: hold right button and move mouse left or hold right button and click left button)
14. create beautiful presentations without using Microsoft PowerPoint (even online)
15. change keyboard shortcuts