We've written before about the large collection of videos aimed at developers that Google has made available. This list of nearly 80 examples may be of much interest to open source developers, including seminars on Android, OpenSocial, and more. Now, Google has added technology roundtables to its free video library. These feature Google engineers discussing search technology, Map Reduce (considered to be Google's secret search sauce), working with clusters and the cloud, and much more. Check out the details at WebWorkerDaily.