Yeah PNG's only show transparent in Firefox, not in Explorer. Might I suggest that you take that render, use Gaussian blur (3.0) and then go to edit>fade gaussian blur and use the sof or hard light blending mode? It will greatly increase the quality of the picture, you can also use different blending modes, but I usually use soft or hard light.
Oh and by the way Amnestometh, you have no right to say that someone´s first post can´t be a sig request. There is NO rule that doesn´t allow someone to ask for a signature even if they have only a couple of posts, so please don´t go tell people they can´t request for things if they only have a few posts.