The biggest reason that services like this will win, is that they're aggregative in nature. That is they make life easier for their users by aggregating data from disparate sources. It's something I tend to wax poetic about but it's really the way of the future. At the end of the day truly novel ideas are getting fewer and farther between - aggregating data from elsewhere however is easy to conceive (if sometime tricky to execute) - Ben Kepes