I really like this idea! I don't have a smartphone, but I would like to support you if I could. Do you have a page listing all of your customers, so I could go to them and tell them it was because of your site?
Speaking of which, how are normal people supposed to find these mobile sites? Maybe you could have restaurants pay you to list them in foursquare or equivalent.
Well, the way I find local restaurants (on my iPhone) is:
1) Pull up Google maps and search for restaurants.
2) Pull up Yelp/Urbanspoon and search for restaurants.
Then I often find myself wanting more information than Google/Yelp/Urbanspoon provides, so I end up going to the restaurant's listed website on my phone. 99% of the time, the website isn't in a format that I can easily use on my phone.
Do you provide the option to opt-out of the mobile version? I get really, really frustrated by mobile versions that are forced on me with no option to say "no thanks, give me the real thing".
Speaking of which, how are normal people supposed to find these mobile sites? Maybe you could have restaurants pay you to list them in foursquare or equivalent.