Fasten your seatbelts, and get ready to test drive Kestrel yourself. After more than a year of development, we invite you to test Opera 9.5 alpha and tell us what you think about it.
In short, Opera 9.5 alpha is:

• Performance
  
• Full history search
  
• Improved site compatibility
  
• Access for everyone
  
• Improved platform integration
  
• Preview of bookmark and Speed Dial synchronization
  
• Magic Windows build number
  

And much more! Take a look at the huge changelogs to see what is new:
Windows
Mac
UNIX

Don't forget to report bugs, but check the Known Issues list in the changelogs and discuss them in the Beta Testing forum, in the opera.beta newsgroup, or in #weekly first.

And now: go and get it! We recommend that you make a clean install and copy over your profile data (but not your preferences file) if you'd like to test the upgrade procedure. You may not be able to downgrade if you upgrade an existing install!

Stay tuned for more updates and builds on the Desktop Team blog.

Download:
Opera 9.5 alpha for Windows
Opera 9.5 alpha for Mac
Opera 9.5 alpha for Unix