Webinars and webcasts on all kinds of technology topics have exploded in recent years, and the good news is lots of the best ones are free. All you need is a browser to attend them, and most of them stay archived online for long periods of time. For open sourcers, there are both ongoing webcasts on cutting-edge open source topics that you can attend on a regular basis, and previously produced ones that may be of interest. Here is a collection of both upcoming and archived ones that could be of interest to you.