Neil Gaiman. Of course.(Well, maybe)
I did want to meet Stephen King too. And that Harry Potter writer, and George R. R Martin who I did meet 15 years ago but didn't know it until ten minutes after he'd walked away. That sucked. ;P Peter S. Beagle (I think that's right) I have met him actually. He wrote The Last Unicorn. He has a band which I never knew. He seemed nice ;P
I'm sure I want to meet other people but I can't remember who they are at the moment. Also they don't need to be famous. There are lots of cool people out there who aren't famous at all. ;P that I'm sure I'd love to meet.