I asked Bob to explain an he even got it mostly right

The new anti-bot things are:
A Registration question that isn't so easy digitally but is for flesh an blood, at least in theory. If you fail the question when making an account it errors out an you have to go back an try again.
A Blacklist. Or rather, two. One is from wikipedia and I believe it is the one they themselves use, the other is a local list that we can tweak as needed should it be.. well, needed.
The blacklist works by if your post has phrase that matches the backlist the post won't post but will error and you can go back and edit your post and so on. There is one downside to this in that the blacklist changes and it is big, very big. Normal chatterings should not trip it however. In theory you all should not see any differences, but this should keep the place cleaner as it were.
(An to be clear both of the things I put in were mods for smf; while I have to put it in by hand someone else gets the credit for making them in the first place!)