I think that an occasional announcement by a contributing member of a board is okay, but drive-by's and those that "announce" more than they contribute is unacceptable.
There are legit ways to spam, all you need to do is search the board for threads discussing something that your new product would apply to.
For example, if I was going to advertise a special for advertisers at ContentLotto, I would not just make an announcement that we had a special going on at CL. I would do a search for "webmaster traffic" and find a thread where someone was asking where the best place to advertise their product to webmasters. Then I would bump that thread with my response that CL might be what they were looking for.
Some people may not approve of this resurrecting of old threads, but it is entirely possible that the person asking is still seeking an answer.
Just my $.02
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