WhatsApp for iPhone (free for today)

Whatapps for iPhone is free for today.
Grab it before it going paid again.

WhatsApp Messenger in iTunes Store

• WhatsApp Messenger is a smartphone messaging app which allows you to exchange messages with your friends and contacts without having to pay for SMS.
• WhatsApp Messenger is cross platform and available for iPhone, BlackBerry, Android and Nokia (beta) and yes, those phones can all message each other!
• To send and receive messages, WhatsApp utilizes your existing smartphone internet data plan: 3G/EDGE (or Wi-Fi when available)

Thanks Ko Boyz for the info. :)