Just added a link over on the right side of the page under "websites" for the Distance Education Clearinghouse Conference Database, which, well, here's the description from the site:
The Conference Database of the Distance Education Clearinghouse identifies worldwide conferences, seminars, workshops, and other events of interest to distance education and related fields. Events may be on site or online, but in all cases, the topic must always relate to distance education. You can find conferences by title, location, or date. Call for Papers information is also available in the Conference Database. Additionally, you are invited to submit a conference or call for consideration for this database.