Oh good, I'm not the only js programmer here. I never understood backbone.js - it's not mvc, and the * part of mv* is so random in it, it's hard to figure out where to put logic sometimes. I'm still looking for a good structured mvc library/framework. I found something really cool called Meteor, but that's a little too structured and repetitive and synchronous, and I found socketstream, which is promising, but it isn't ready for gametime yet. I just program for fun, so I haven't made a huge app yet, but my stack consists of:
node.js for backend plus express.js
mongodb for database
as my apps haven't gotten that large yet, I haven't felt the need to use an mvc framework - yet - so clientside I use zepto.js plus vanilla js (I organize my files, but I don't have a defined mvc/mv* kind of setup)