Not all popups are bad...
... but some popup killers are not smart enough to recognize that!
You don't want your popup blocker to block these, as this may interfere with your normal browsing.
If you click on a link, then it is safe to assume that you actually want to open the page, popup or not.
Safe Popup Examples
Click on any of the links below. You should see a new browser window open.
Good PopUp #1
Good PopUp #2
Good PopUp #3
Good PopUp #4