Jesus (yes, we've met, but I need more) and now I'm looking forward to seeing Deb again. John, son of Zebedee, (aka "the beloved disciple"). William Blake, though I think he might not be a great conversationalist or otherwise easy to be around. Those are probably the biggies.
Others: Donald Miller ("Blue Like Jazz"). Anne Lamott. W. B. Yeats. Percy Shelley (though, again, I don't suspect he'd be the greatest to talk to). Bill Clinton. Jimmy Carter. Franklin Roosevelt. Martin Luther King, Jr. Jim Wallis. I'd like to chat with Rik Leaf (check out his myspace and his podcast).
Hmmm, really, I like the idea of just spending more time with the wonderful people I've already been introduced to--family and friends and such. I'm realizing that they're more incredible than I'd previously imagined.