The other day, a friend of mine found out that someone she had done a blog makeover for went and used her code to make over someone else's blog. My friend found out when she checked in on the site she had done only to see "I just did this makeover" posted. She emailed the person and contacted the blog owner and was eventually compensated.
Once I was dropping entrecards and I noticed that one blogger had a post divulging someones contact information. The reason? He had been stealing her posts- verbatim and posting them on his site. In her opinion, it was useless to pursue him legally since it is hard to actually prosecute and it wasn't worth the effort. She asked her readers to email etc. the guy and do whatever they could to more or less harass him. He probably deserved it.
The truth is, that you can put all of the copyright protection stuff on your site but people will still steal. Nothing is 100% safe on the internet. So what do you do if someone is stealing what is original on your site?
I had one friend that would perform a check weekly and if she found out someone stole from her she would leave many comments on their site thanking them for using her words and in the future to remember to link to her.
While few people actually make a living as a professional blogger, there is a blogger code of ethics, not unlike in other walks of life. It has to do with courtesy. Ask first and always link back. It's how you'd want to be treated.