This was a hard rule for me to accept, but you can't post your article on HP again your blog or vice versa.
However, what is acceptable and quite a good practice, I believe, is to write a paragraph or two about your hubpages topic on your blog and link your blog to hubpages article.
For example, for my hub about "How to Publish a Children's Ebook," I wrote a blog entry entitled "How to Publish A Children's BOOK. (I was careful not to use the EXACT same title) and then I wrote this blog entry:
"Presumptuous title, this one, but I needed to get important keywords in for the search engines, and "Billie's Mistakes to Avoid," didn't seem like the way to go when I published this article on hubpages.com. I really did try to cover many of the pitfalls I encountered when publishing 'Lucky, the Left-Pawed Puppy,' and I think you'll find at least a little something useful in this article on hubpages whether you're publishing your ebook for children or a wider age range..."
Then I grabbed the screen shots from my hub article and linked that blog entry here to hubpages. The concept is that hubpages needs EXCLUSIVE articles, but advertising those on your blog without copying the content is permissible,as I understand it. Of course, this is only MY own interpretation of the rules and you'll get others to explain their individaul take of this rule. I find the staff at hubpages most responsive in email a question when I'm not sure of a rule. Cheers, Billie