Linkpad is hosted on Google App Engine, which recently enabled a new billing policy. As a result, we blew our free quota provided by Google. This resulted in some downtime with an error message. We apologize for the inconvenience. So far, Linkpad has been a free-to-operate, free-to-use service, and we would like to keep it that way. We are going to try to optimize the application so that this doesn't happen again.
UPDATE: We have increased our quota. This will ensure there is no further downtime for the foreseeable future.
