I built this in about two hours. The phone number is provided by dropio, but I plan to switch to twilio in the near future. I built it out of boredom, so constructive criticism, even if harsh, is welcomw :)
Nice. I was wondering how you did this. I've not used dropio phone numbers before, but I've done work with twilio. You could certainly add some killer features using twilio. Very nice app.
[edit] Actually, I'm not sure about twilio's conference call abilities, so maybe I spoke too soon.
They have the ability to connect calls, which is basically the same thing. I bult it with Dropio first as a proof of concept, as I did not want to spend much time with Twilio if no one was going to use it (TWIML is not very Ruby-friendly if accessed through Twilio's ruby library).
if you'd like to be added to the developer preview for Twilio's conferencing API please drop us a line at help@twilio.com and we'll add you to the list.