I'm in the middle of this
class right now. I can't say enough good about it. The author, Holly Lisle, is a professional writer with 32 novels published (and working on her 33rd), so she's really got the art of coming up with novel ideas and writing through to the end down to a science. This course is pretty much her entire method for writing a novel. It's really, really professional--it includes how to come up with ideas that you love, how to maintain interest and excitement through the middle, how to surprise yourself while you're writing, and how to write queries and synopses and all that marketing stuff, among many other things. So far I'm over halfway through the course but only 12,000 words into the novel I'm writing for it, but...wow. I have actually shocked myself several times already with the book going in directions I didn't expect (but that I love). I have never had so much fun writing a first draft before.
She also has a lot of free resources, articles, and writing exercises on her website here