Today we open a new open source project where we use PL/JSON: PL/COUCH
PL/COUCH are some Packages to access couchDB directly from a Oracle-Database.
You can find us under: http://code.google.com/p/pl-couch/
I hope it's OK that we use PL/JSON.
Looks interesting. It's good to hear that PLJSON is being used.