For my website greenmowers.org I added an auto blog that also posts new pages to twitter, delicious, Instapaper, and Plurk, more content to the home page, and directory backlinks. But my site just fell in rankings when it was updated by the spiders. I was in the middle of first page of google for "green mowers", now I am on the very bottom. Why? Last year I was 1st and 2nd for both "green mower" and "green mowers" My keywords are growing as well, it appears.
I think It is because of the recent Google Penguin 2.0 update, if your site still exist on the first page, I am sure that your site is not penalize by Google, just work on it, and build more real backlinks on high page rank. I may suggest you to remove the aublog as it is risky now. Hope this helps!
Yeah, I recently fell down a couple of spots after the update. Hasn't majorly affected traffic but I got it back up by adding a few new links and articles.
Have to agree with HostGarou about removing the autoblog - too many people were using them on spammy sites and im sure the search engines have caught on to this so would have something in the algo that might affect the site.
Hi, I think your site has been penalized by Google penguin update. Nowadays, you should collect quality backlinks than quantity.