At the Super Bowl 42 Experience Todd signed at the Topps Autograph Pavilion. Here's a picture of his autograph on one of his Spider Man comics. I think this is an awesome cover and Todd signed it with a green marker. The autograph really stands out.
Every time I've met Todd he's been really cool - - he's also been really late for his autograph time! But he's always been really nice, so you end up forgetting that he was late.