bill - 6:44 am on Jul 3, 2008 (gmt 0)

I approach it kind of like I did all the standard meta tags back in the days of AltaVista, Excite, Lycos, Infoseek, et. al. Just include them all on a few potentially relevant pages.

If you have a local site that could benefit from customers finding your physical location, then there's no reason not to try most of the tags mentioned above.