I'm working with Cocoon since summer 2000 and became committer in 2001. My main application area for Cocoon is a database lab that I taught at the Technische Universität Darmstadt for the Databases and Distributed Systems Group during 1997 to 2003.
Consequently, my major interest is developing web applications and integrating with (object-) relational database systems. Among the many different techniques available, ESQL and the database actions have been the focus.
Some more stuff can be found over here.