A great resource featuring Web Seminars is available from Penn State Natural Resources Extension. You can link to their main page here.
These web seminars (also known as web casts and webinars) feature articles that will be of interest to anyone managing a woodlot as well as those with a general interest in trees, forests, and related topics. Their main page provides you with the option of linking to previous seminars and viewing upcoming seminars.
You will need to register to participate in the live webinars. Click here for registration.