The folks at Opera Software have released a new version of the Opera browser for Windows, MacOS X, and Linux. Although it's still in development, the new Opera 9.5 alpha already includes an extensive array of improvements, including a tweaked user interface, a redesigned address bar, online bookmarks and settings synchronization features, a history search feature that searches the contents of visited pages (accessible by entering opera:historysearch in the address bar), better site compatibility, and faster performance.
Detailed change logs showing the Opera 9.5 alpha's additions over previous versions can be viewed for Windows, MacOS X, and Linux/Solaris/FreeBSD. The software can be downloaded from those links, too. As with all alpha-quality software, though, we do advise that users exercise caution.