And also stuff like Friend Connect, MySpace Data Availability, Facebook Connect, and clouds: AppEngine, Amazon Web Services/EC2/S3. And timeless marvels such as Software As A Service (SaaS).
Also widgets & gadgets, esp. as how they integrate into social apps, and development on Flash/Flex/etc. We also have discussed mobile web, microblogging (esp. Twitter, Plurk), and lots of non-tech stuff like restaurants, travel, and where to have the next event!
For beginners to gurus, and also those wanting to understand how social apps and cloud computing can integrate into a larger strategy.