Good day,
I'm currently finding out why I have lost all of my website's rank in google.
I don't even appear in google results by the domain. But other sites do link me and they appear in the google results. 
I think it's all about leaving my site two months alone and finding out I had 20k in comment spam, which I completely deleted and fixed with filters and adding a new Disqus comment service.
Thing is, I added my site to Google Webmaster Tools and I'm finding out several awful things. For example, when I click in Google Fetch As GoogleBot. I receive this error message below in response to my request. And I don't even know what's the real problem and how to fix it. I simply don't get it. This is what appears:
  Date: Wednesday, July 20, 2011 9:43:35 AM PDT
  
  Googlebot Type: Web
  
  Download Time (in milliseconds): 55
  
  HTTP/1.1 403 Forbidden Date: Wed, 20 Jul 2011 16:43:36 GMT Server:
  Apache Vary: Accept-Encoding Content-Encoding: gzip Content-Length:
  248 Keep-Alive: timeout=2, max=100 Connection: Keep-Alive
  Content-Type: text/html; charset=iso-8859-1
  
   
  403 Forbidden  Forbidden You
  don't have permission to access / on this server. Additionally,
  a 403 Forbidden error was encountered while trying to use an
  ErrorDocument to handle the request. 
Do you guys know anything about this problem ? I need to have Google crawl my site again. I used to have a really nice google result in the past three years. Now, there's nothing. 
thanks,