Lovely spam
Well, now I know what happens when I go too long without posting: the spambots swarm in.
It's actually been interesting watching them work. First a single spam comment shows up, all on its own. Not so bad, you think. It's just one. I'll get around to deleting it in a day or two. But that was just a test, you see-- the spambots are checking to see if the blog is under active moderation. Since I'm lazy, the blog looks abandoned to the spambots (and my readers, too, I unfortunately suspect), and they post hundreds more spam-comments just like it the next day. Ugh.
There are several ways I can deal with this, but I'm loathe to use many of them. I want it to be as convenient as possible to comment, and so I don't want to require actual people to register for accounts to type in CAPCHAs. Instead, I've turned on Bayesian filtering. With luck, this will be able to separate the spam from actual comments and contributions (all of which I appreciate, by the way) in a manner completely transparent to my readers. But if any comment of yours is accidentally captured by the spam filter, drop me some email and I'll free it from the filter's clutches.
Thanks, and more actual content coming soon.

I've found that the filtering
I've found that the filtering that comes with Wordpress works quite well. I think both the wordpress blogs I use default to "the first time this person posts it has to be approved, but after that they are automatically approved", which works well -- brings spam to my attention without putting undue burden on posters or slowing down the comments section. (Speaking of slowing down, what's up with requiring me to preview rather than just post? Or requiring http:// in my URL rather than just roleplaying accordingly?)
Whoops
Sorry about that last bit-- I thought I'd disabled the 'mandatory preview' thing. And I had-- but only for 'posts' and not 'comments'. In typical Drupal fashion, the setting for 'posts' can be found by clicking on 'Post Settings', while the setting for 'comments' can only be found by clicking on 'Content Types', choosing 'Posts', then expanding the options for 'Comment Settings'. Oh-- and there is no indication that there is any difference between 'posts' and 'comments'.
Typical open source project. Great functionality-- terrible usability and documentation. I can see why hiring managers explicitly seek Drupal proficency: it takes a while to learn all of its idiosyncrasies. Anyway, should be fixed now. Any other suggestions re: the site's workflow?
As for your suggestion regarding the Wordpress filtering: does that requires that people create accounts and be logged in when they comment? I'm not sure I want to enable/require that, yet...
It works!
32 spam comments automatically caught and filtered out! Take that, you bastards! *does happy dance*