Google's user interface mockups and YouTube video were a hot topic the other day, and that buzz will likely continue until we finally see a tablet device emerge from Mountain View to accompany the Nexus One.

If the images and video weren't enough proof for you, changes are under way in the Chromium source code which certainly make it look like Google is getting serious about a new interface for Chrome OS on touchscreen tablets.

Coming soon to the Chromium nightly builds is an --enable-vertical-tabs command line switch. While the source note clearly states that this does nothing other than toggle a preference right now, there's every reason to believe that it will move the Chrome tabstrip from the top of your browser window to the side -- as shown in one of Google's tablet user experience slides.

It's a starting point -- though I'm more interested to see how the tab switching interface shapes up.