I peeked the code a bit and you got some good stuff there, like the Model class and the Http class to wrap on top of Prototype Ajax and also support Jsonp. I'm

I peeked the code a bit and you got some good stuff there, like the Model class and the Http class to wrap on top of Prototype Ajax and also support Jsonp. I'm actually building an app that has the contacts feature as well so it's interesting to see another design and coding approach . With the foundation of your application right now, you can extend it to support CSV (or sources other) import in no time, or adding a bunch of new functionalities. The biggest question is to find out how to charge people for your service. I truly believe in startup that aims to make money on day 1 and this is the only future-proof way to keep your service running for the long run. Also, get at least IE7 support. IE is a must for serious businesses, not like this: if (Prototype.Browser.IE || Prototype.Opera) { var safari = Html.a({ href: 'http://www.apple.com/safari' }, 'Safari'); var chrome = Html.a({ href: 'http://www.google.com/chrome' }, 'Chrome'); var firefox = Html.a({ href: 'http://www.mozilla.com/firefox' }, 'Firefox'); var links = safari + ', ' + chrome + ', ' + firefox; Notice.error('Your browser is not supported. Please use:', links); } Good luck!