I spend a great deal of time online. I got to Writer's Digest a lot. I found several articles to be useful in the current trilogy I am writing and in planning for the second series I have bouncing around in my mind.
A checklist for developing your hero or heroine http://writersdigest.com/article/developing-your-hero-and-heroine/
Writer's blueprint (I didn't use this for Immo, but will probably use it for my 2nd series) http://writersdigest.com/article/your-novel-blueprint/
Understanding your character http://writersdigest.com/article/9-questions-to-ask-your-main-character/
Writing mistakes http://writersdigest.com/article/Beyond_Basic_Blunders/
I'll add more as I go through my bookmarks.