Although blogs hosted on sites like Blogger, Wordpress etc are covered by copyright laws. But because the notice is not there, a lot of people assume that this is 'in the public domain' and free to rip off and use for their own purposes.
This is wrong, and is legally enforceable (Although you'll need a lawyer and some details from the blog site to make sure it can be upheld in court). In future however, having a worded copyright notice on your site (in a sidebar or permanent footer) will discourage others from doing the same. There are a few sites that provide information how to cover yourself online, which I suggest you hit up as soon as possible, a quick google search should reveal a few local and nation sources you can use.
Remember the Editors words: The Internet is a public domain, but that does not mean you are free from litigation if you decide to bad mouth said publication over this. However if you wanted to say "Take a look at this website here" and "Take a look at this blog post here" and "Check their publication dates and this blog post" and sent it along to a dozen or so online news services, I'm sure someone would be interested. Maybe even a local newspaper, local to the magazines offices for example...
Of course I suggest this last step after the legal options have run dry (and your lawyer/solicitor says its clear to do so).
I myself use Wordpress to blog with and they have a support page covering Content Theft http://en.support.wordpress.com/content-theft-what-to-do/
Some of the information there should be useful.