1. Working with Emily and Arnaud
2. Drupal and I becoming friends with each other
3. Putting Faceted Search to work
4. Views-enabling a foreign database
5. Releasing a site with a YSlow "A" grade for performance
6. Implementing a custom single sign-on client
7. Oops! Implementing a custom single sign-on master
8. Importing a quarter million user accounts
9. Importing a thousand or more documents

and

10. Just the totality of working on a project that touched so many aspects of the JEDEC organization and seeing it all come together in the end: design, functionality, and technology – what joy

This was a fun one and I'm so very glad it has launched!