I'm currently taking a series of SF/Fantasy writing workshops from Northwest author Cat Rambo. The sessions are taught online, using Google+ Hangout, which is proving to be an ideal tool for the job.
We're halfway through the series and it has already been immensely helpful. Cat is an excellent instructor with a wealth of experience in writing, editing, and teaching. It has also evolved into an amazing networking opportunity, as I've been able to interact with the other students, and, in some cases, with their writing networks as well.
Cat will be offering several additional workshops over the coming months, and I highly recommend them to anyone interested in writing SF, fantasy, horror... or just about any other type of fiction. And just in case... here's the full URL to her workshop page:
Go forth and register!