The Federal Depository Library Program hosts several free webinars throughout the year. Each webinar focuses on a different Federal database or resource. You can register online and attend for free.
Upcoming webinars include:
Beyond Google: Tips for Government Information Research (August 19)
Accessing Census Bureau Statistics Using the Data Tools (August 28)
Everything You Wanted to Know About PubMed (September 23)
If you missed a webinar or they already covered a topic, you can catch up with archived sessions in this federal agency webinar archive.