Orrery appears to have attracted link spammers, who use open access blogs and wikis to increase the Google PageRank of their sleazy marketing pages. The first one I noticed is bublik2010, who is pretty blatant - s/he seems to post the same set of viagra/cialis/herbal remedy links to every single discussion thread. The rest of this site seems legit prima facie -- generating this post was the easiest way to draw it to your attention.
Examples
see, e.g., "http://orrery.us/node/10"
There is no way to stop this without human intervention: human cockroaches like bublik2010 will sneak into any forum they can. The only way I've found around it is to manually monitor every forum, banning the scum when it surfaces.
Comments removed
Thanks. You are absolutely correct. We need to get more hard-core about monitoring to nip this sort of thing in the bud. Thank you for pointing it out, my apologies for taking so long to get to it.
New system in place
We've installed a new blog anti-spam system, Mollom which should reduce this sort of thing.
Did you guys try the image
Did you guys try the image verification thing?
You could also use nofollow tags on all links.