Try looking around the Aftermarket Software forum, here, down below on the main page of this board. You'll need one you can download to your desktop computer, load via Desktop Manager, as well as the SMS ability. Good luck.
Edited to add this link... http://www.blackberryforums.com/afte...ahoo-chat.html
and I gotta say this--your Pearl is nothing as fun as it could be, without the BB Data Plan!