What if you made it so that your signature had just three lines.
That or do the cool thing and go without a signature. All of the cool kids are doing it these days.
Code:
Line 1: a system or gadget that you want to feature that week. your newest, one you've been using a lot, or just something you pulled out of the closet and found interesting that week.
Line 2: a quote or project or other tidbit that you might want to share. Something like copy bunny but MUCH shorter.
Line 3: a link to your user page, where all of your systems and projects and things might be listed permanently.