Your service looks awesome, especially the "we'll keep nagging you until you f...ing respond" aspect. I've looked at a lot of similar services in the last few months (you have no idea how relevant your startup is to me at this time), and I definitely am interested.

One thing I'm wondering about is why you have no international calls. I would love to pay (a lot) more money if you could support international calls. Without that, the service is only half as useful, and I will sleep only half as good during the night. :-)