Barbara Tillette’s webcast called RDA Changes from AACR2 for Texts has already been published in several blogs.
What I find interesting is that this is a good general introduction to RDA and significant changes from AACR2. Much of the information has already been published in one form or another. And, unfortunately, the focus remains on print materials, i.e. texts. Another point to consider is that the many of the options that Barbara talks about concern LC practice, which other institutions might or might not want to follow.
With that in mind, this is, however, a good starting point to learn about how RDA differs from AACR2 with examples. Please note that in order to view the webcate, you will need RealPlayer.