How are you using/analysing tags in Omeka?

I'd love to chat with people who are analysing tags in Omeka:
- Tags added by front-end users
- Tags added by contributers
- Tags added by archivers

Personally I'm using Omeka to archive data for my doctoral dissertation in the hope of constructing an online ethnography. As I enter data I tag it with keywords, brainstormed on the spot (so first level coding). Now "themes are emerging," I'm interested in hearing how others are analysing tags / other use cases! :)