Over the last year or so RIM has been pushing hard to develop an ecosystem of BlackBerry developer groups around the world. That has lead to RIM now having almost 35+ developer groups from Chicago to Cairo and Kharkiv to Buenos Aires. RIM lists all of these developer groups on their website here along with details on how you can create your own developer group in your area.
Let us know if you are part of a Developer Group and what your experience has been. I have been the the New York City developer group and it was a very handy resource and great way to meet other developers nearby.