Does anyone here use Whats App?

Whats App for Blackberry (http://www.whatsapp.com/ota/)

Whats App for Android (http://www.whatsapp.com/android/)

Whats App for iPhone (http://itunes.apple.com/app/whatsapp-messenger/id310633997?mt=8)

Whats App for Nokia (http://www.whatsapp.com/nokia/)

Free, replaces text messaging and uses your data plan instead.

Setting up a group chat for #HostingCon2011 let me know if your interested.