As per my research and development that if you want to create long tail keywords for your website, then you can do some research and create your own keywords base on that research.
Do keyword research on Google tool and also on word tracker, then generate both combination. you will find an effective keywords for your website.
I like the market samurai free software It actually pulls the information from Google and better than Wordtracker because of that. Plus I like the Free part, who wouldn't? Check it out http://MarketSamuraiFree.com
HitTail works like Google Analytics -it's basically NOT a long tail research keyword tool - those dumb-heads ask you to install tracking code on your blog, and try to find profitable keywords - give me a break!!! IF i were to stat a new site, how is it going to help!
I tried Keywordshack - it sucks man! Just SEOBook, Google Keyword Tracking tool and WordTracker have actually given me good results to date... any other suggestions from anyone??
why do you want long tail keywords anymore? For adwords campaigns? Because using them to build highly targeted niche sites has long since been shown to be counterproductive.
i have using some free tools such as wordtracker, keyworddiscovery etc and feel the similar results like Google adwords.
There are several good tools and I've provided information on all of them including free blog tools at http://wwwblogideas.co.