Making use of the overflow and scrollLeft DOM property to scroll elements is a much more effective use of the CPU, over animating using CSS top/left. So this episode of J4D demonstrates the same effect used in two completely different ways.

The second was a request from Trevor Morris who's involved with/runs Geek in the Park. He asked whether the techniques I used in a jQuery marquee plugin I wrote recently could be used to smooth out CPU spikes that were occurring on his site when the header pattern flowed.