I'm working on a site which has a very wide base of long tail search terms and is presently ranked #1 for a few general terms which apply to the industry. There is not much in the way of overlap for the long tail keywords over the general keywords.
My present methodology for identifying new long tail target keywords involves a bit of guesswork and a lot of
Google's Adwords Tool, however, I am interested to know what other WebProWorld users would recommend.