I have no problem with sigs in general. It's the, in Paul's word "garish", ones I get annoyed with. I like seeing the different sigs as long as they're kept to a reasonable size.

If you don't want to turn off all sigs, only the annoying ones, Firefox and Mozilla users have a solution. :)
There us a plugin for Firefox/Mozilla called Adblock that allows you to block individual images or pieces of code (javascript, flash, etc...) on any page. See a sig you don't like, right click on it and block it. You can even block images from entire domains if you like. (Very good defense against users such as Guido)

Thanks! I just got it and blocked Simons pic! Now I can enjoy the sigs, including my own! :-D