BlackBerry Bridge

Update: It looks like RIM may have pulled this knowledge base article - we'll try to see what's up but for now it looks like the OTA soultion may still be the best bet.

If you're a BlackBerry PlayBook owner that hasn't yet installed BlackBerry Bridge for whatever reason, RIM has made the files available for installation via Desktop Manager. This means that AT&T users who still haven't jumped on the OTA download of the Bridge app can grab the software straight from the source and install to their device from a PC. AT&T still has no sign of making BlackBerry Bridge available to customers anytime soon, but at least users can still get the software through various methods. If you're worried about AT&T catching up with you for using this method - don't be. Hit the link below for more info.

Install BlackBerry Bridge using Desktop Manager
Install BlackBerry Bridge OTA to your device

Source: BerryReview