Something game-industry related. His commentary on the Wii is interesting to hear (even though I'm a supporter of the Wii), so it'd be nice to hear him talk about other things, like other companies, developers, possible ideas, progressions and trends, etc.
He's already doing some of this in Extra Punctuation, like his opinion on the situation with Roger Ebert's opinion, or even that delightful Turok review he did a while ago. But there's easily plenty of material for him to get an entire ZP episode out of other than just a single review.
Speaking of which, I wonder what his E3 review will be like...