I have seen a lot of "Testing my sig" threads in the forums. This is annoying spam that could be prevented. Maybe on the Forums section of My Profile, you could put a place where you can see if your sig and avatar work? Like at the bottom of where you put in the URL for your pictures, where you type the sig, all that. Have a window that shows the layout of any post you make, which would incorporate sig text/images/links, avatar, name, everything you would see in a normal post you would make. This would get rid of the problem for good, along with reducing spam.
-Vash the Stampede
Need help? Ask me via email, msn, aim, or forums and Ill see what I can do.