We added some scripts that will truncate tables on a weekly basis now. the DB is about 40+GB and needs to be compacted. We could probably save about 10-20GB.
My thoughts are export ( via data pump), droping of tables or Db, recreating DB in proper size (since we have 64bit version now), then import.
This would be on a Friday night or Sa, Su via teamviewer or some other tool and a conference call. Good English or German is a must.