If you have one of the newer blackberrys (mine is a 7290), and you don't need a huge amount of speed or bandwidth (e.g. checking in for your flight online, etc.), you can use the blackberry as a (not-quite) highspeed internet connection via the USB cable.

It will even support VPN if you need to check the email at work.

This has saved me some bucks on at least one occasion.