>Opera have released the first alpha of the new version 10 of their flagship product, Opera (for the desktop). Major changes include:
- Presto 2.2 engine
- 30% improved performance (at least this is what Opera claim)
- support for web fonts
- increased CSS 3 compliance (including RGBA and HSLA)
- developer tool Dragonfly has been improved
- Acid 3 compliance
- support for the W3C Selectors API
- improved HTML5 support
Other things, less important to web developers, include inline spell checking and automatic updates.
For more information, check out the detailed change logs for Windows, Linux/UNIX and Mac OS X. Note that big parts of those documents overlap eachother.