Many companies are waiting one or two service packs/fixpacks before moving to new software versions, regardless of whether it is a database system, an operating system, or the software that holds together day-to-day operations (ERP). Well, let's start moving to DB2 9.7, FP1 is out now. No excuses anymore...
A list of enhancements is available in the Information Center, a general DB2 9.7 FP1 overview including the list of fixes is on the support page. The major enhancements include even more PL/SQL support to make it simpler to move off of Oracle and "read on standby" in HADR environments.