Doesn't do anything on Firefox 3.5.3 on OSX :/
After I reloaded the page in Firefox, they are working on all 3 browsers. Kind of baffling.
I know how frustrating "doesn't work" is as a bug report but I can't give a lot of detail since it all works now. When it wasn't working, "dragging" would just select text on the page. The "draggable" red sliders would not move.
I can't wait to play around with this thing. Tap-and-fling everywhere.