Google Penalty...
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Hi,
Do you have past ranking data ? If you hit by Google penalty, you will see lose ranking. Do you received any warning in Google webmaster tool ?
Note: I have checked your landing pages, I think they are keyword stuffed. You have used bold tag to many times on page.
Google Guideline: http://support.google.com/webmasters/bin/answer.py?hl=en&answer=66358
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First, check on the dates you traffic dropped in Google analytics. Then look for any Google updates on those dates. That is the easy way to identify which update caused the drop.
Have you got any warning emails from Google webmasters?
As your site is still indexed (I checked now), this ranking drop might be caused by some algorithm change.
Here are some good resources about Google penalties and how to identify them
From SEOmoz blog : http://www.seomoz.org/blog/identifying-link-penalties-in-2012
From Search Engine Watch : http://searchenginewatch.com/article/2141098/Google-Penalty-or-Algorithm-Change-Dealing-With-Lost-Traffic