There are no doubt industry directories, but will cost you a pretty penny to license.
I don't know that I would trust data from any "free" or inexpensive source. I did do a quick Google search, and came across a few forum postings on free databases (a couple of years old) as well as somebody selling one for $20 that he CLAIMS he has redistribution rights to. Bottom line is, if you didn't compile it yourself, and it's not from a reputable source that you can trust, you have no idea where the data came from, and it could get you in legal trouble.
Web sites are generally going to be a no-no, assuming you intend to copy the data - they are going to come after you for copyright violations. They are "free" for users, but certainly don't want to give the data away to other sites.
There's some unsettled law in the area of directories, which has been discussed extensively here. If you are willing to step into a thicket, have a good attorney, and are willing to pay legal fees to defend yourself, perhaps you CAN get away with copying. But not for the faint-hearted.
You could always look at Wiki resturant guides. Make sure you read their licensing terms carefully, though, to make sure it really is OK to copy and use the data in the manner you intend to. Same problem, though, with legal issues: there's nothing stopping a Wiki user from entering data from a commercial directory. A few corresponding misspellings or incorrect addressees (they're put in directories to detect copyright violations) and you're facing a lawsuit.