Aerize has just released WiFiX for BlackBerry. WiFiX is a bit more powerful than it seems; it can reroute connections to and from any connection. For example: WiFi <> BES <> BIS <> TCP/IP <> WAP, so it can actually enable usage of many programs without the need for a BlackBerry Data connection (BES/BIS). Since it can import and export settings it is highly configurable for the future.
We are actually using Google Maps and a bunch of other apps on BlackBerry with only WAP data connections. Furthermore, it will enable WiFi when the user has NO mobile data plan at all.