A while back we let you all know that BlackBerry was still actively doing development on the BlackBerry PlayBook OS and for those of you who might have missed it in the forums, a new OS update is now available for download. Noted as OS 2.1.0.1917, this release doesn't bring any huge changes along for the ride but it updates a lot of the system files as well as the Adobe Flash Player version and the Adobe AIR version.