This blog gets tons of spam posted to the comments, so I’ve got the prefs set up so that all comments have to be approved by me before posting unless they’re from a user I’ve previously approved. So your first comment won’t show up immediately.
In addition, I auto-trash any comment post that includes key words that are common in spam posts. Unfortunately, it’s possible that a genuine comment might get filtered that way, and I’d never see it and have a way to approve it. So if you want to post a comment including a mention of Paris Hilton or something, best to email it to me directly (joe at deltatao.com), and I’ll post it somehow.
Here’s my spam word filter list. I wish my filters kept track of how often each of this was triggered.
Since filtering all those words, the number of comments I’ve had to deal with has dropped markedly. I have no idea why pseudomembrane and multilocular show up as spam words all the time.