i imagine that one of the simplest contracts you could create would be something like an automated subscription service contract. This would be useful to many companies and content providers. I can imagine this kind of thing taking off early as many companies would value a totally automated service which collects payments and even authorises access to content.
What do people think about this. I cant help feeling something like this is a good useful starting point. Many of the potential ideas that could be implemented by ethereum are perhaps exotic. Maybe basic utilities like this will have a more immediate impact on web based content providers.