I am not trying to be rude in any way here Crunch. I'm just setting something up. Look how long it took for us to convince you that IM+ did not use VoIP to make the call? I'd wager most of that would be rooted in your expectations of how Skype works on your laptop/PC. If that works across wifi on the laptop, why doesn't it work on my Bold?
20 years experience in IT development has shown me no matter what is defined in the spec as pre-req, there are always those that want it to do something it isn't designed to do. And then they get upset when it doesn't do that. I'm working with another company right now. The pre-req is you MUST have GSM 3G service. Yet, everyday someone asks why it doesn't work on EDGE or on CDMA.
I said all that to say this... If Shape or iSkoot or Skype were to put out a BlackBerry client and stated it must use 3G, there will be a storm of protest over "Why doesn't it work on my 8800?"
Granted, that's the old Tech Support engineer in me talking.
The bigger reason may be development cost vs potential market base and return on development investment. The Bold is the first 3G Blackberry. It's only been out a few months in most of the world and a few weeks here in the US. There needs to be a pretty significant installed base to have the market potential to sell enough clients to offset the development costs and then make a profit. We are still very early in that process. The proliferation of WiFi enabled devices will help expand that base. And could provide enough market opportunity to make the BlackBerry an attractive target for a VoIP based client.
Before anyone get's excited and talks about the Verizon & Sprint CDMA phones being 3G in addition to the Bold, I'm not discounting their numbers. However, in discussions with various developers, the code needed to make a streaming app work well over 3G and the code to make it work over CDMA can be significantly different. Enough to add quite a bit of development cost to the process. Not impossible by any means. But it's not just a simple port.
My own personal opinion (& YOMV) is the BlackBerry market just has not developed the 3G installed base to offset the development costs to build a VoIP client......... YET. That day may come.... at some point. Time will tell.
That's all predicated on the idea that the carriers will continue to allow VoIP traffic across their 3G data networks. There is no real indication the carriers will continue to allow a direct competitive technology to be used on their networks. I have seen a number of discussions around the net over carrier resistance to VoIP and blocking of those protocols. Who knows?
I'd love to see a VoIP client for the BlackBerry. I'd be right on board. For now, I'll just use Bluetooth tethering from my Bold to my laptop and use Skype on the laptop. Takes a bit longer to set up. But it works and takes advantage of all my Skype features while I am traveling around the world.