Travel Technology - Is there a broadband card for Tmobile to use on a Macbook Pro?

Is there a broadband card for Tmobile that will work on my macbook pro?

I don't know, but there are many cell phones that you can "tether" to your laptop to provide net access over the cell phone network. I have a HyTec "star trek" phone which is sold as the Cingular 3125. With it, I can use the bluetooth connection to have my Mac connect to the internet via the cell phone with my phone sitting in my pocket. Works pretty well. I think many other phones have this tethering capability. Just make sure you have a service plan that won't hammer you for data use.

The instructions I found for my phone are here:
http://mobilewirelessnews.com/2006/02/13/tether-cingular-2125-mac-osx-bluetooth/