Listing everything I've done and seen is almost impossible, so I'll mention some highlights:
- Coreboot is now available for a limited set of laptops
- CERN is using Open Source Hardware
- Tips and tricks for caching in web development
- History of Open Source licenses, and other license related stuff
- Team meeting with phpMyAdmin, outlining the future of the project
- The talk of Freedombox mentions dreamplug : looks like a nice toy :)
- Meeting a lot of people, both from my own team, people I've met at GSoC mentor summit, people from UGent and people I haven't met before
- Community building : what works
- Why Open Source should get non-geeks involved in their projects
Looking forward to the next edition already : about 360 days to go. :)