Ask HN: Question about rewriting my app in NodeJS

I've been developing a "pinterest style" app (for lack of a clearer explanation) in Rails recently. I've been focused on learning Rails (I'm a PHP developer) the past few years. There is a ton of talk about Rails and MVC altogether being eventually phased out for stacks like Node and Backbone, etc. While I doubt the Rails/MVC style will be gone anytime soon, I want to future-proof my career. I don't want to stick with PHP forever, I just don't get the same joy anymore that I used to when I write code in it.

What should I look into learning in NodeJS/Backbone to rewrite my "pinterest style" Rails app. I'm probably still going to release the Rails version just because I feel comfortable with the code I've written and the Node/Backbone rewrite is mainly for learning the technology.

Are there specific Node paradigms/patterns/modules that I should look into for a site like this?