If you are a big fan of the longtail, then make sure you read Chris Anderson's book on it if you haven't. He also has published a book on using FREE to market your business recently. Put the two together and its magic
Johnny, you asked for any tips and I've had a hard time coming up with any. I guess part of the beauty of hittail is its simplicity. I created a similar application like Mike did with hittail years ago. It was called searchtrax. I wasn't able to keep up with the server/programming requirements, but it essentially worked the same as hittail with one exception. Hittail provides you reporting based on all your pages. This drives me a bit crazy, as I really like looking at keywords based on the page versus sitewide. So here is what I'll do ... take your hittail code and just put it on one page you are interested in (or a few) versus the whole site to really hone in on what is going on with a specific page. Your data takes longer to accumulate, but a small trick I've found helpful to work on pages of my website versus looking at things from a sitewide perspective.
Another tip, specific to you Johnny since I know how deep you are into adwords. While I agree with the comments that these keywords are all about being very specific, allbeit low traffic are true that can be an issue. If its too low (ie zilch) then your time taking on longtail keywords isn't very effective. What I will do after I spy a word in hittail that may be of interest, then run an exact keyword campaign in adwords to see how popular the keyword is. Sure they are less popular than most, but I still find it helpful to research the keywords using adwords to gauge their popularity. This helps me prioritize which keywords I will work on. Although I have to let the adwords campaign run awhile to get a grasp of which keywords are more popular versus the others.
The last tip, keep focused on productivity. I think it is important to watch your keyword referrals live and get a feel for what is going on with your site. Don't spend too much time where it is not productive though. Set up a system what you are going to do when you identify a longtail word, and follow through on it. By nature you will soon have more keywords than you can possibly work on so the priority is to remained productive and get to work. Start making a list as you do this of ones that you want to research or work on later so you can stay on task with producing. If you don't do that, its all very interesting but you won't get ahead.