I've noted that the SPAMMers have gotten better at their miserable little trade. There are more of them and they are now able to get their messages on virtually every stock board almost daily.
Just how long will it be before the SPAM renders the boards useless? Given the unpoliceable nature of the net and the rate of SPAM acceleration, I wouldn't be surprised to see free message boards forced shut within 3-5 years. The intended users will, when this gets a LITTLE worse, give up on the boards -- leaving them like the grocery-store tack-and-paper boards: cluttered, largely unread, and purely for freebie ads.
The SPAMers are transforming themselves from annoying to hateful. But, like the plague of automated answering systems, I fear that they are here to stay for as long as rats exist to carry the contagion.