Yesterday I was having a talk with Adrian Cole and during our talk he had an unpleasant surprise. He found out that he forgot a node running on his Amazon EC2 for a couple of days and that it would cost him a several bucks.
This morning I was thinking about his problem and I was thinking of ways that would help you avoid situations like this.
My idea was to build a simple project that would notify you of your running nodes in the cloud via email at a given interval.