Just went to the site and it has change. If you want to check if your IP or your server is on the spammers list go to the site and select 2005 in the archives on the far right, scroll down to Monday June 20 and see "tip of the month".
My pc slows after being on for a long time and then refuses to shut down. Thinking that it might have become a Zombie I checked the following site. (see tip of the week)
I found I was listed 4 times in spam lists. This did not mean that I was spamming but it was possible that my server was not trusted. You can remove your IP or server from the list but they will return if further spam comes from your IP or server. You might want to check your own IP.