I recently did a guest lecture at the School of Computer Science and Engineering, Sydney. My topic was "An introduction to Agile Software Development", showing how we develop great software here at Atlassian (mainly covering Scrum and XP)
The presentation was geared towards 3rd year students, and I only had 60 minutes. So if you are an experienced agile developer, these slides will contain nothing new for you. However, if you are new to all this agile stuff, and want a really brief introduction, then this might whet you appetite.