Looks like the new forum is letting through more spam than the good old HT4K system. All the ones I've seen so far have been from former Soviet Republics. It's pretty odd because they show up as gibberish since they post using the cyrillic character set, so they're not really getting their message across. What was really hilarious was the one from the Russian online car dealership.
Anyway, one of the other boaty websites I follow is divided into a public and private posting area. Both areas are visible to all, but the private area is only for posts from people who have purchased a product. That pretty much limits the spam to the public posting area while keeping the tech support part clean.
Maybe something similar would work here, too?