Just downloaded the 4.1 Release Notes and looking them over. There are a ton of things in there we could make immediate use of:
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Enhanced Workload Management: Statement-Level Memory
Control
Tight Hadoop Integration
Simpler, Faster Installation: Parallel Installation Utility
Better In Database Analytics
Enhanced Support of Joins for UPDATE and DELETE
Ordered Aggregates and Ordered Reduce Specifications in
Greenplum MapReduce
Transaction Performance Enhancement
Enhanced gpload Performance to Avoid Catalog Bloat
Online Segment Rebalancing Following a Recovery
Performance Monitor Enhancements
PostgreSQL 9.0 Client Compatibility
Oracle Unbreakable Linux 5.5 Support