After google pr updated, my site drop dramtically for almost all my keyword

As of 10/29/07, Google is still updating. This is why it is called the" Google dance". Every thing is jumping around. Wait 2 weeks and then start to worry.

Google seems to be jumping on sites that are doing "linking games", as those sites that sell links are falling.

If you are building 500 inbound links per day, this will be considered a "linking game". Be warned.