You can find long-tail keywords in Google Adwords' free keyword tool. You just type a keyphrase and get results in a click of a button. Other tools that I can recommend you for finding long-tailed keywords to use for your blog or website are Keyword Winner, Market Samurai, Brute Force SEO and Micro Niche Finder.
google keyword tool is the best one to find long tail keywords. with single keyword digging you can find the long tail keywords.
Google Adword, wordtracker, keyword research tool from seobook.com, and other many tools may help you finding Long tail keywords. You can choose long tail keywords that describe your business product or service very well. You can make it location specific also. For an example the keyword sport shoes can be more specified by brand of the shoes or shoes for particular game (e.g. sport shoes for tennis or nike sport shoes for tennis).
You can use Google Insights, Google Trends, Google Competition and google ads tool all free but its also a lot of hard work searching through these pages each time. For quicker researching try Keyword Winner for long tail keywords, it helps you find how to get top position for both low and high competition keywords for blog posts. If you are after keyword research on a normal site I recommend you use Market Samurai!
use market samurai tool, U can get 30 days trial version for keyword researching, just download it from http://www.marketsamurai.com/ by entering Ur name n email market samurai is the best tool for keyword research
Google keyword tools are best for long tail as well as short. But you should check your keyword before choosing it that is it competitive keyword or not.
Use Market Samurai and set the minimum amount of keywords high and than drill down. I have the best success in setting it to around 4/5 keywords minimum. Don't forget to filter search results with 'exact' as 'broad' will give you unrealistic high numbers due to the long tail. SY
Market Samurai is great, but not when it comes to Long Tail keywords. I recommend the Keyword Research Tool by Keywordshack. Given the 7 day free trial period, and the unbeatable price there is no better keyword research tool because it is specifically designed for long tail, low competition keywords. Give it a spin yourself - and tell us what you think