Technically, it’s still “stealing” because its your content on their domain name, of course when somebody clicks on blog post links it’ll go directly to your web site.

However, if you use links such as:
<a href="/somedirectory/file.html>

Then it’ll go to their domain, and thus will receive whatever search engine “credits” for such content.

The problem is, search engines might punish you too for having duplicate content (although I think this is rather unlikely in your case).

After writing all the above, I checked this out: http://co.cc/

You probably should too