Hi! Full disclosure: I'm interning at Opera now. Site compatibility is a tricky issue, however it is one of our main goals. I'm personally working on OperaWatir, an Opera backend for Watir (duh). That means sites can take their existing Watir suite and run them in Opera. This should really help for sites like Facebook who have large Watir test suites and arn't currently targeting Opera compatibility. Official release date? When it's done :) However, you can read about it here: http://my.opera.com/core/blog/2009/03/06/test-automation-wit...