[ZoFreX]

Lots of restaurants have cash flow issues or aren't even making a profit even in the best of times. This would be a seriously risky move for a web agency in many cases and I would strongly advise against doing it unless you can afford to not get paid at all.

[mgkimsal]

it would have to be contingent on trusting both sides to be honest and open re: finances. I'm thinking a little bit more of the groupon model - you pay me for every successful booking (or, booking that turned in to a paying customer). Given how many food places seemed to JUMP on groupon, they could take it one step further and say "instead of one time influx of bargain hunters, we'll manage your website - to our definition of good - and you pay us $x/table"