As you may know, Rogers restricts its tethering plans to only 1GB of data and above. Those who have 500MB data plans or 500MB value packs will have the ability to tether using your BlackBerry device and a BlackBerry PlayBook. This has been confirmed by myself, as well as many Rogers Wireless customers.
Reason? Data goes through the BlackBerry phone as if it’s being used on the BlackBerry. Rogers cannot determine if the data is being tethered or not. That being said, the Playbook does not compress your data, so watch your usage.