I don't have Photoshop ready but would like to show this to creative. That's why I ask instead of testing it myself :)
we will add export raster layers as images but lates now we have list of more priority features
for more question you can write to support@css3ps.com
On a side note what I discovered yesterday - you can create nice vector graphics in InkScape (free tool), open its source (it's just XML) and copy-paste <svg>...</svg> into HTML page and bang - you got your design in your page and you can manipulate each aspect of this image via JavaScript just like you would manipulate plane HTML code.
I bet it do not work across browsers tho...