buckworks - 12:39 am on Apr 10, 2012 (gmt 0)
AdWords really does take broad match too far sometimes, and a strong negative keyword list is your best defense.
Invest an hour to brainstorm with a good keyword tool, specifically looking for terms that should be blocked. Identifying even a few dozen words to block could make a big difference to the cost-effectiveness of your campaigns. Add more words to your negative list as you come across them, days, weeks or even months later.
TIP: if you find words you'd want to block from more than one campaign, create a list for that in your "shared library" so you can add it to multiple campaigns. That way when you come across a new word to block, you only need to add it in one place.