As far as sig sizes go. I agree with simone. They should be limited to like the 1 inch "button banner" ad size.
And Timechange, why wouldn't you use your allocated sig space here to link to the page that details your many real accomplishments as a webmaster? I've seen that site. I think you call it your 'resume' page or something. It's quite impressive. I'd bet you'd get a good job or two or three from members or lurkers here if your sig was a button link to that page instead of big pics of half naked chicks. JMO.