CrazyEgg[1], the click tracking tool, has a good interface that gives you a heatmap of how far people are scrolling down your page. It's very handy.
I feel like I can't be the only one who does this.
I thought of using CrazyEgg in a few situations myself, but I think it would not work well if there would be more visitors behaving like I would than they presumably have anticipated.
PS: Nice work on Sipsmith!
And thanks: I've been nursing some of their damson vodka over Christmas and it's excellent stuff!