Legacy Family Tree Webinars - They provide genealogical webinars nearly every week. Their usual time slot is Wednesdays at 2pm EST but they also do some on Fridays and other times. The webinars are free when viewed live and for 10 days afterwards. Viewers have the option to purchase CDs of the webinars.
Family Tree University - They provide live and on-demand webinars as well as a fall and spring virtual conference chock full of webinars. There is a fee associated with these webinars so check for the prices though discount coupons are frequently available. Follow them on Facebook or Twitter for the coupons. Webinars are held at varying times.
Dear Myrtle - Dear Myrtle has been right there at the forefront of webinars since they began to take hold within the genealogy community. The Dear Myrtle webinars are free and the upcoming schedule can be found on the Dear Myrtle blog and on the GeneaWebinars Calendar. Archived webinars can also be accessed from the Dear Myrtle site.
Michael John Neill - Neill, the author of Casefile Cluse and Genealogy Tip of the Day, regularly holds genealogy webinars. His archived webinars are available to buy via download. There is also a fee for the live versions. Find notices of upcoming webinars on his Rootdig blog.
Illinois State Genealogical Society (ISGS)- Societies are getting in the swing of providing great webinar content too. ISGS is presenting webinars every month and they publish the full-year calendar in advance which is great for scheduling. Webinars are held the 2nd Tuesday of each month at 8pm Central (9pm EST). The live webinars are free but replay is only for members. Access to their webinar library may be enough to convince you to join!
Southern California Genealogical Society (SCGS) - Pioneers in the webinar arena, SCGS was the first society to offer webinars to their members and the public at large. Called the Jamboree Extension Series, they also publish a full year schedule in advance. Their live webinars are free but membership is required for the replays. Webinars are held twice a month on the first Saturday at 1pm EST and the 3rd Wednesday at 9pm EST.
Association of Professional Genealogists (APG) - APG has begun catering to the needs of its members by providing business focused webinars. The topics might also be of interest to genealogists in general or people who are considering becoming a professional. The webinars are free to watch and the replays are available in the members only section of the website. See the GeneaWebinars calendar for individual webinars by APG or look for press releases on the APG website.
Friends of the National Archives - Southeast Region - This is another regional group that is providing a full year slate of webinar content. The topics tend to have a more southern focus but some are general interest as well. The webinars are free to watch live but membership is required for later viewing.
You can view the full schedule of webinars by ALL genealogy webinar providers at the GeneaWebinars site.
If you know of any other webinar providers that I have missed please let me know so that I can add them to the list.