Some time ago, I have written this post about human spam, since then I have moved Go2linux to Drupal 6, and have installed mollom on the site. Mollom is really taking care of the spam, specially spam bots, I have also installed another module, which do not permit to post links in the comments, this two tools, have stopped the spam in Go2Linux. If you still want to put a link in the comment, put it as simple text, people interested in reading your link will copy and paste it, but bots like google bot, will not follow them, and also we will have only good comments.
Yes the comment posts have decreased since I have installed those tools, but now it worth to read them.
Hope you may find the site better now, enjoy it.