RIM has just updated its Messenger & to include a new set of features, primarily "BBM Voice".
This allows you to make free calls around the world via wi-fi to all their BBM contacts. BBM 7 also adds multitasking and split screen functionality which allows users to check email and use other apps while on a call.
BBM 7 is a free update for all BlackBerry smartphones running BlackBerry 6 OS or higher.
excellent move RIM