For those that are left in the cold by AT&T (and possibly others), here are the OTA links for the latest BlackBerry Bridge that enables BBM on the PlayBook:
BlackBerry Bridge 1.0.0.83 OTA for OS 5
BlackBerry Bridge 1.0.0.83 OTA for OS 6
These downloads are for your phone, not for the PlayBook, and these are from the same source as the previous OTA links (see
here for reference). Those previous OTA links have proven to be safe, so these should be fine as well.
NOTE: To get BBM on the PlayBook, you need to apply both the Bridge update (1.0.0.83) and the BBM update (5.0.3.22) on the phone.