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Robert_Charlton - 7:01 am on Jul 3, 2008 (gmt 0)
The danger in using such a meta tag, I believe, is in relying on it. If you believe that the tag is all you need to optimize a page for an organic geo search, then you most likely haven't done your job. I think in most situations you need to really think about possible vocabulary for a geo-search, and figure out how to optimize a page or a site for various combinations. It's often not easy. This does pull me into the discussion. ;)
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. Yahoo has geotagging for Flickr.