Yeah, you get 750 hours per month total for free, within the confines of the small amount of disk, RAM, and bandwidth you get. I always make sure to terminate any machines I spin up once I'm done testing so I don't get charged for going over that (which is hard to do, you have to run multiple machines). There's also a bandwidth cap, I think it's around 20gb total, then you start getting charged. 20gb is more than enough when running the five tests we have that are blocking for cloud; as long as the machines are terminated once tested, it's really hard to have an overage.
Geoff Marr
IRC: coremodule