To be fair, the admins around here are very fast. The spam-bots keep getting better and better that's for sure. In this case most of the new spam is made under 1 or 2 accounts rather than 10 accounts with one post each. I assume that's easier to fix?
Hopefully the next forum software update will succeed and hopefully it helps out.
I had the same thing with the guestbook on my website. On some point I got like 1 spam message a day and it was manageable until it went up like crazy from one day onto another. Hopefully it's fixeable, my guestbook wasn't