I just tried to add my weather wunderground sticker back into my sig., and for the life of me I couldn't remember how to do it. It was all in html.

Just for future reference, I found an html converter.
http://www.seabreezecomputers.com/html2bbcode/

I just copied the html for my particular area and choice of sticker from the wunderground site, pasted into the converter, hit convert and there it was. Copied that into my signature area in User Control Panel, and Bingo!