A quick note: Akismet, the WordPress spam filter, seems to have some trouble with false positives lately. I.e. a number of valid comments were flagged as spam.
I try to eventually de-spam these comments in order to train the filter. This causes some duplicates when people have written a new comment to replace the one that didn’t appear. If your comments don’t appear, drop me a short note (a short comment) to let me know there’s a missing comment, and I’ll de-spam it ASAP.