networkliquidators - 5:26 pm on Sep 3, 2010 (gmt 0)
First, your links from wikipedia, view source and see if rel="nofollow" is the link to your site. Next, getting links from free directories won't hurt your authority.
Onsite and social networking activity is weighing heavily in rankings. Not to mention, Google has been toying with visitors worldwide in where your visitors come from.
I can help you more if I know your domain and industry. I would also suggest looking up where you are losing traffic by country. I know I receive quite a bit of international visitors and have added a Google translation tool which is actually being used decreasing bounce rates and increasing time spent on the page.
Don't forget to check to see if you are receiving longtail searches, like phrases with 4 words or more. If not and you were, your authority may have dipped a bit. If you sell products, Google is also rewarding more phrases with the brand in it to the originating brand website.