For developers to build their own telephony apps they need to be able to mimic the various legs of the telephony infrastructure (switching, call routing, event notifications, and more) known as flow control. The Bandwidth API allows developers to bypass building the flow control from scratch.
We see a lot of mashups (our directory lists over 4,300 mashups). Lately we've noticed that they've moved beyond your ordinary application. Here is a quick overview of some recent additions that are fun and useful.