Qubes OS 1.0 released
 

After nearly three years of work, I have a pleasure to announce that Qubes 1.0 has finally been released! [...] I would like to thank all the developers who have worked on this project. Creating Qubes OS has been a great challenge, especially for such a small team as ours, but ultimately, I'm very glad with the final outcome - it really is a stable and reasonably secure desktop OS.

http://osnews.com/story/26334/Qubes_OS_1_0_released