I gave an online Zotero talk for GALILEO last week. Here's the audio and video archive. It's part software how-to and partly a discussion of how I teach and support Zotero in our library. EDIT: No password needed -- just leave it blank and click Enter.
I'm doing another one for them in November (and one on Libguides in early August), and I hope to be a little less awkward with the Wimba presentation software at that point!