I’ve been a fan of Carl Ford’s work with Pulver.com for many years. His interoperability and bake off events at VON’s gone by were some of the most exciting aspects of community building in the VoIP world ever conducted.
He’s also hot on the trail of some points I’ve raised before about apps and features being the core elements of VoIP’s future growth so I encourage you to read his post on Jeff’s blog. He’s right on the money and his offer to meet up at Fall VON is one event that should be on your calendar if your in the application and feature space.