Since most people here have membership sites and many of them are paid, I'm wondering how you're planning on dealing with Googles new spam tool they like to call SideWiki.
With their new spam tool people can post the password to your membership site right on the site itself. Your competitors can post their links on your site. If you run a dating site, people can make contact with your members directly on their membership page without joining your site.
The trend has already been seen that competitors are spamming and slamming each other. At least one person has suffered a vicious personal attack in his Side Wiki and is now suing Google for damages. At least on person who sells a digital product has had the link to their thank you page posted on their site so people can download without paying. Bloggers are noticing that people are now commenting in Side Wiki rather than on their blogs.
Most people are convinced that Google will soon be adding adsense which means your advertising revenue will go down if you have adsense on your site.
This tool is pretty disgusting but I did a search and it doesn't seem to have been mentioned here at alll so do people not know about this or are you just not worried?