Taking a break from their holiday Lutefisk and Akvavit, the Norwegian developers at Opera Software put out version 11.60 of their popular cross-platform web-browser. Opera 11.60 is an interim step until Opera 12
is ready, which is still being worked on due to GPU hardware acceleration
issues. Opera 11.60 meanwhile delivers on many of the Opera 12 features.
Opera 11.60 provides a brand new user-interface to its built-in mail client, ships with Opera's new HTML5 parser (Ragnarök), and there's many other changes.
For more information see the Opera blog
or the Opera 11.60 Linux release notes