Opera 10.60 Beta has been released for Windows, Linux/FreeBSD and MacOS X. This is the first Linux beta ever since Opera started working on Opera 10.5x and 10.6x (so there were only alpha Opera 10.5x and 10.6x builds for Linux up until now).
This new builds add WebM, Geolocation, Web Workers, HTML5 offline Web Applications, Cross-Document Messaging update and many more. In addition to these new/improved features there are quite a few bug fixes for Linux/FreeBSD as well as performance and core updates.
This build is official (not just a daily snapshot) which means you can download Opera 10.60 beta from the Opera website (Ubuntu .deb included).