It is always a risk due to spammers but we are going to open up the commenting a bit and see what happens.
As of right now non-registered visitors to this site can add comments to a post. The catch, the comments go into a queue and have to be approved so they could take anywhere from a minute to a day to appear the site.
The perk of being a REGISTERED member of the site is that your comments are published directly to the site without the need for moderator approval.