The Sloan Consortium: This group offers lots of great workshops and webinars if you want to get started without laying out cash for a membership. There are more opportunities for members, though.
ASCD: This group is not just for online educators, but it is useful for those folks who are interested in curriculum and assessment.
Turnitin Academy: If you have a Turnitin.com account, they have lots of webinars and training opportunities to show how this is not just about catching plagiarism. Turnitin can be a great teaching tool if you know how to use it! You can view archived webinars, but why not attend an upcoming one live?
Online Conferences: While the listings below are for the 2011 conferences, getting acquainted with these conferences now and signing up for updates is a great idea.
Learning Times: Online Conference/Web Events
E-Learning Conferences Worldwide