This is Chromium, also known as Google Chrome, running on Fedora 10. It'll probably look the same on all Linux distributions including Ubuntu and Debian.
In its current state it's totally unusable. Browsing is not possible. Stuff like Download and History fails with same "Aw, Snap" message as the screenshots show.
Fission is a great addon/plugin/extension to Firefox that moves the progress/loading bar to the address bar, similar to what Safari has. The color is adjustable. Requires Firefox 3 or better.