Much to my dismay, I've been forced to turn off comments on older posts. Anything within a half-year range is still active, but any posts older than that are now static. This doesn't mean old comments have been deleted. All of our insane ramblings are still present.
The reason? SPAM commenting has become a much more serious problem of late, with spammers sometimes dropping 1,000 or more comments within a 24 hour period. Most of these are caught by filters, but some of them, the random-letter strings that have been showing up lately, hit the front page and that's not good. Today, I even woke up to an angry message from a spammer. He was upset because I blocked his IP addresses (yes, more than one)!
I sincerely apologize for any inconvenience brought upon legitimate users as a result of this decision. If the problem gets worse, I'm going to return to a registered-user-only system.