Hunter is a quick and easy tool that you can use to find work emails on LinkedIn profiles. Simply open up some ones profile, and click the hunter button in the ribbon and there you go. In addition to that person you will see that it found a specific number of other emails from that domain and you can copy them all.
The Good: Great too, easy to use, seems to get something for most profiles
The Bad: Only gets work emails, can interfere with new LI UI
The Ugly: Says it will work on any website, but that is not true