Sharing the internet connection from tethering!

I have really started enjoying tethering with my Blackberry because it truly gives me internet everywhere at a great price. My Rogers $30/6GB plan includes tethering so it works very well. What I discovered is that it is even possible to share that connection to other Macs. My Mac is tethered through bluetooth, so it leaves airport available for sharing the connection. In the sharing tab, you want to select the cell phone connection as "Share your connection from" and Airport for "To computers using". It is also important to add WEP encryption in the "Airport Options" to make sure your airport network is only used by you. WPA is unfortunately not available.