Traffic Travis has also this feature, check it out. Thank me later
Oh... and check seoprofiler too...

Definitely Traffic Travis as well as Market Samurai (14d trial)!

Traffic Travis might be by far the best though.

I vote for Traffic Travis as well! Certainly the best and most accurate.

Yep,used them both Traffic travis as well as google adwords both seem to work well,not used seo profiler though have to check that one out!

I'd go with Traffic Travis too, from my own experience the results are pretty accurate.

Depends on what you're trying to accomplish ... I often go long-tail to research topics for articles. Here's what I do:

1. Brainstorm as many related terms as come to mind for a few minutes.

2. Use Google Keyword Tool to expand that list ... paste in my list of 20 (or whatever) then export the results and get rid of anything unrelated. Let's say my list is at 100 now.

3. Use the keyword scraper in Scrapebox to expand my list to many thousand possibilities.

4. Throw them into Market Samurai for keyword analysis and filtering based on the criteria I'm searching for.

Another vote for Traffic Travis. It works well especially for those just starting since it's more simple to operate and another advantage, it runs on its own platform!

#1 Keyword Software & Keyword Tool for Keyword Research & Tracking