No Plot? No Problem, by Chris Baty has helped me more than any other book on writing. It's written by the creator of National Novel Writing Month and geared to get you banging out that word count. Though I don't write at such a frenetic pace any longer, (50k words in 30 days), the lessons learned from this book have served me well over the years.
I also highly recommend the Writing Excuses podcast, with Brandon Sanderson. This leans more toward speculative fiction, but can work for any genre.