Hey all, apparently Viber the VoIP app that is on iOS is coming to Android sometime this month.
There's a thread in the iOS forums about it: http://www.geekzone.co.nz/forums.asp?forumid=76&topicid=72954&page_no=1
Sounds pretty cool.
All comments are my own opinion, and not that of my employer unless explicitly stated.
tanivula: Can you use Viber as a SIP client?