One of the big downsides of Mumble, Teamspeak and Ventrillo is that they aren't made for business. This means they are really hard to get up and running, which is especially annoying when you are just just trying them out. We're actually working on something similar to these tools but built for business.

We're currently in private beta and I'd be interested to get your input on what we're building. We've got a quick walkthrough here https://www.youtube.com/watch?v=KV7HBXuhT7Q and you can signup for the private beta at http://speak.io