Some nice CSS trickery
The wizzy CSS chap over at marcofolio has done a nice bit of trickery with parallax and transparent images. Check it out by clicking the image below and then resizing your browser like a man possessed (unless you have IE6, in which case, grow up here):
[caption id="attachment_82" align="alignnone" width="356" caption="Giddy up"]
[/caption]
Thinking hard about somewhere to use that!