Everyone can take part in this email I received earlier:
Sign up below to receive a Nimbuzz trial version that offers FREE VoIP calls (Nimbuzz to Nimbuzz, Windows Live/MSN, Yahoo, Google Talk) and cheap international calls via NimbuzzOut.
The app is ONLY available for Bold 9700 and Curve 8520, and works over Wifi.
Join Nimbuzz for BlackBerry – VoIP Alpha here
More for terms of service>