iotum Talk-Now 1.0
the author of this app says:
Tired of playing phone-tag in order to get in touch with others and have them get in touch with you? Try iotum Talk-Now.
SHARE your availability,SEE who is currently available to talk with you,and BE NOTIFIED when someone you're trying to get in touch with becomes available.
iotum Talk-Now uses your BlackBerry calendar, presence and other sources of information, along with your preferences, in order to define your personalized availability.
Best of all, it's free.
New users can download Talk-Now by visiting http://www.iotum.com/blackberry
Existing users can choose the menu item "check for updates" from within the Talk-Now application on your BlackBerry,