Very nice. Here’s just a small thing I’d change: You update the url using backbones router.navigate, right? If you pass {replace: true} in the options object, the browser won’t create a new entry in the history as it does right now but still update the URL. http://documentcloud.github.com/backbone/#Router-navigate

yes, exactly, that's how i do it. maybe i'm missing something, but why do you suggest not making an entry in the history?

The user is scrolling one long page, not navigating between 'pages'. Having entries inserted into the history while scrolling seems very counter-intuitive to me.

mh yes that makes sense.

i think the reason why i did this, was because initially the preview und market links didn't open in a new window. but you're right, if the user is staying on one page, he doesnt need a 'back' functionality.

thanks for the feedback, i already changed it, going to push it later...

Nope.

I fully agree with the title you chose.