You have over 100 outgoing links on your index page. That is probably penalty land.
“Excessive links – Google recommends having no more than 100 links on any given page. Having more than 100 links won’t result in a ban but it can result in a lower PR.
If you refrain from using any of the above techniques you can avoid a Google penalty. The best way to attain a high PR and placement in the Google listings is to stay on Google’s “good side”. Now that we have the “don’ts” out of the way, let’s get started with the “do’s”!”
quoted from: “xhttp://www.rlrouse.com/prevent-getting-banned.html”
Just another guess.
Good Luck!