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Craigslist has a spam report option, so if you try to spam their board it'll likely get caught, which could make spamming it a waste of time.
They do have a forum that let's you drop url's, and you can certainly post announcements. But I can't see Craigslist being useful beyond a being a component of a word of mouth/awareness campaign.
I can't recommend Craigslist as part of a credible link campaign.
Its not listed in the backlinks of Google for me. Haven't digged that deep in other engines as of yet. But I would seriously not spam craigslist as it will make them impliment ebay user accounts to the extreme.
This was a year ago, I don't know if anything has changed in the meantime.
I'm sure you could post some links that wouldn't be spam and they would remain up but they would not last long term as mb points out.