Google Chrome's Flash plug-in went primetime in May, and its PDF counterpart, arrived last month, though it was disabled by default. Now, in the latest dev build, Google has turned the switch on, and the internal PDF viewer is now enabled by default. Interestingly, Google states a known issue where PDF plug-in doesn't load on Linux. If you happen to be running Chrome dev on Linux, let us know if the plug-in is working for you!
Apart from the plug-in change, it looks as though another big chunk of Chrome's UI will soon be moved to a browser tab. Just as the bookmark manager.