How much of Flow’s nearly 900k of (minified!) JavaScript 
    do you think is the application developers filling in 
    the deficiencies in Backbone?

I'm trying really hard to resist saying something overwhelmingly snarky about SproutCore apologists, but this article is trying to be a slap in the face of Backbone.js, and libraries like it ... so if you want to have that discussion -- bring it. You think 843K of JavaScript is too large for a truly comprehensive and gorgeous app like Flow? The SproutCore hello world app for a broken-looking table view weighs 717K, when measured in the same way.

But there's a bigger question here, when picking on a library that's only been around for 6 months: Has anything on the scale and professionalism of Flow ever been accomplished by a SproutCore app, in SproutCore's 4 years of existence?

I think that the proof is in the pudding:

http://www.sproutcore.com/showcase/ (2 of the 4 belong to the SC team)

http://documentcloud.github.com/backbone/#examples

'nuff said.