A couple of things:
1. Number the slides in the bottom, it's mildly useful :-)
2. Mention the licenses of these slides for redistribution (Creative Commons, anyone?)
3. The "Browsing through the Tor network..." bubble seems a bit small and thusly looks like an annotation that is lost in the diagram. Maybe make it bigger or have it encapsulate the 3 nodes with a mild grey background. This is on the slide 6 (titled "Browsing the internet through Tor")
3 and 1/2. Same applied for Slide 5, "This is how you browse the internet..."
4. Maybe a near-final slide jokingly stating that It's "Tor" not "TOR", but maybe that's a bit too tongue in cheek or off-topic.
5. Provide a short link for the "running relay/bridge/node" that goes to a decent intro of what that means.
6. The use of the word "documents" might make users think that means "all downloaded files", maybe update to mention "(doc, pdf)" in brackets in addition to you mentioning it in script (which I see you do).