I have tried to rename a schema using:
test=# update pg_catalog.pg_namespace
test-#     set nspname = 'jochemd'
test-#     where nspname = 'public';
This didn't work out very well, the schema became invisible in 
pgAdminII, something I wouldn't want to do to our customers. (It was 
still accessible using a schemaname.tablename notation and appeared to 
work technically correct.)
Is there any way to rename a schema?
Jochem