I've also seen some recommendations that you setup random searches for any material that you put online, so you can see if anyone else is using it.
Very simple to do. If you have a blogger, google or youtube account (etc), just click on 'my account' at the top and then select google alerts and add any you want. Go to the same place to change them.
(paper stand image from http://www.freefoto.com/ .
This image http://www.freefoto.com/images/04/24/04_24_61_thumb.jpg?ffid=04-24-61&k=Newspapers )