Ads selling guns, drugs, your kid sister, etc. Read over the craigslist TOU. Drink a lot of coffee if your eyes glaze over. You agree to it every time you post...might want to read it at least once, right?
Anything illegal, unethical or in violation of the craigslist TOU Ads containing another persons' personal information, infringing someones' copyright or any other illegal activity, and so on.
Ads posted too many times. Having 3 or 5 or 8 or more ads up for the same thing is Not Good. You might think you are being clever posting to each sublist in the Bay Area and beatin' the system but..uh...all those ads show up on top of one another when searching the site. Delete the old ads if you repost them.
Commercial posts in the Wrong Place. Hello, Big Apple Futon? Are you listening? POST IN SMALL BUSINESS ALREADY!!!! [Note: as of this writing craigslist is experimenting with allowing some commercial posts in the regular advertising categories. Read about it here.. But a misplaced commercial post could still trip you up as could abusing the new system in the works]
National spam. Post your ad once on the craigslist site nearest to you. If you post your ad in multiple cities you will have problems. (Your main problem will be Clint, the head Customer Service guy. They don't call him "The Hammer" for nothing. Good guy, but don't mess with him).
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