My first try with SB, Archy the Spider. It isn't finished yet, swing around the obstacles. You can also use the floor and top to bounce around.
I especially wait for the clear drawing buffer with alpha fix, actually it stays black you can see on top. It will scroll a fullscreen background, this may slow down a little. It would be great if there's a faster solution to do such fullscreen renderings. Firefox seems not to work yet.