I saw this on the Adventures in Genealogy blog. The NARA will be hosting a virtual online genealogy fair. There will be lectures on a variety of genealogy topics. All will be available for free. All will be available as a podcast for later viewing.
It is a two day affair. Adventures in Genealogy has the schedule of events. The topics range from military records to the Chinese Exclusion Act to citizenship.
You can read more about it on the NARA website.
You can also follow the fair on Twitter with hashtag #genfair2013