At this stage there are lots of decent web tutorials but I find Ryan Bates Railscasts some of the best for learning the technology. However if you want to just become better at Ruby and Javascript there is no substitute for good books. I've just been reading Avdi Grimm's Confident Ruby and I thi...
The viral strategy needs to be a natural extension to the app that requires SMS - not sure you want to just use it for the sake of it being viral (seems forced). A perfect example of this is the Twist app. The app tells someone you are meeting with when you will arrive. When you set up a twist ...