I've recently become a fan of Craftsy's web classes. If you are looking to learn a craft have a look. They even have a class on tatting taught by Merilee Rockley. She's yarnplayer at etsy in case you didn't know. I'm a big fan of her dyed threads.
Oh, and they have sales on classes often. I'll post when they do here at my blog so you'll know. Just click on the link to get to their site.