You got it, it's 650 pixels by 200 pixels.

This new rule has been decided by members of Stoptazmo and not by admins/moderators. See this thread.

You have till Monday, May 15th 2006 at 09 00 EST to make sure your signature (images+text) does not exceed the size decided. If you are seen using a bigger signature, a two week ban shall be imposed.

Edit: Your signature shall not exceed 1mb either. This has been decided by the forum administrator in the interest of keeping the site dial-up friendly.