We currently don't actually allow any signatures, some people have cleverly found a way around it <img src="smileys/smiley2.gif" border="0" align="middle" /> but I'm afraid for them in the upgrade they will be all disabled.
I know a lot of people like them but I find they add a lot of vertical height to the forum threads/posts which makes casually viewing them a lot more time consuming.
Also OP's was I think a spam link, so I had to remove it anyway, if you're not a spammer OP, sorry!