In the Hubpage help section, http://hubpages.com/learningcenter/how-to-file-a-d... These allow you to check for text and photos. It also explains the procedure to follow if you do find someone has copied something of yours.
Just this morning, I had an email from Google after contacting them regarding copied text of one of my hubs. I had found someone using it on Blogger. The email said they would disable the URL shortly.
I will of course check back to make sure this was done.
I have also found others that will involve a fax to the hosting site as the person's email is false.
Do go and check to see if any of yours have been copied and make sure you follow through, I feel only as a joint effort can we deter this from happening.
Also, in the forum, one hubber is compiling a list to send to Google. If the copied work is ranking higher than the original than he wants to know.
Good luck with your efforts.