Perhaps I don't fully appreciate where it is my content ads are being shown - can someone give me a full list?
There isn't a list available to advertisers. You will have to look though your logs for googlesyndication. The page that sent the click will be in the referer info. If you are having 5% CTR from content ads, you really probably want to look heavily through your logs and see if you are being scammed by some websites doing click fraud.