Fluff is missing

Our lovely bundle of claws, teeth and hair, Fluff, has disappeared. He's been gone for over a week and we're rather worried, especially with the weather that we had last week. He's not a stupid cat - being a stray we've been taking care of, he's very streetwise, and he won't go near other people - but he's never been gone for more than a couple days, even when he's been on the look out for queens on heat.

So, we're worried and a bit upset right now.