Simon Peyton-Jones
I'm quite excited about this: it is a great opportunity to expose Haskell to a bunch of smart folk, many of whom won't know much about Haskell. My guess is that they'll be Linux/Perl/Ruby types, and they'll be practitioners rather than pointy-headed academics.
One possibility is to do a tutorial along the lines of "here's how to reverse a list", "here's what a type is" etc; you know the kind of thing. But instead, I'd prefer to show them programs that they might consider *useful* rather than cute, and introduce the language along the way, as it were.
As for me I find quickCheck a killer feature, and quite concise. While on the subject, i'd like to mention that at last PLEAC now has a "standard" haskell version: http://pleac.sf.net/pleac_haskell of course, it's still a long way to go: only 9% is done, nice comments should be added, better code... But it's quite useful already! (i know pleac is somewhat a duplicate of http://haskell.org/haskellwiki/Cookbook, and it's not always adapted to haskell, but i still think it's quite useful and worth working on it. i suggest it's time to remove the pleac bashing from http://haskell.org/haskellwiki/Cookbook)