A lot of popular websites have pretty crappily written JS code. The reason it's not noticed is that usually it's served compressed. The reason why it's crappy is that the bulk of functionality is implemented server-side, and the person who ends up writing that code is primarily a server-side programmer who half-asses a JS snippet to finish the feature, and then since it works, it is never refactored. It's not "real programming" anyway ;)
I would like to see a website with very good javascript code.
I feel like it's basically impossible to write JS and have 10 or more people with 3-5+ years go "Yeah, I can't improve this at all and it's extremely clean".
About a year a ago, started from scratch writing a front-end client SPA for web-based software -- it's a custom framework built around Backbone.js and jQuery, written in CoffeeScript. The .coffee files are beautiful, and on save a shell script automatically compiles all the .coffee files down to a single JavaScript file that I would describe as good JavaScript code.
Not open source, so no demo, but it's definitely possible to create good JS.
