[vec]

> Keep in mind that Ember.js and other frameworks like it are really only valuable to people who are writing single page javascript applications. If you aren't, or you are against the idea of building single-page applications, then these frameworks won't really do much for you. Although, you can still get some value out of them.

This is fairly true of ember specifically, but much less so for some of the other frameworks. Backbone and Angular, in particular, are very well suited for building "islands of richness" in otherwise traditional sites. Even if you're doing something relatively simple, like a form with live validations and inline error messages, you're going to have an easier time writing it with something to handle the DOM manipulation for you.

If you're wanting to get into frontend JS, start with Backbone. It's much less powerful than the other frameworks, but is by far the easiest to grok, and having it under your belt will give you enough tools to start moving larger and larger chunks of functionality into the browser. Come back to Ember once you outgrow that.