Tiffany Whitehead's blog post that includes two presentations from Follett's "New Leaf in Learning Conference", March 2012. Includes "Embedded Librarianship" and "Next Gen Librarian"
Great presentation from Ellyssa Kroski. Although many of these technologies have much broader use in the college world, many of them will be/are filtering down to K-12.
This was a great webinar about using Skype in the classroom. Classroom 2.0 Live is now creating a Livebinder for each presentation. (They are at noon on Saturdays.)
Simple K-12 periodically offers some free webinars on web 2.0 topics (of course, trying to entice people to become subscribers), but even the free ones include some great presenters and topics