PostgreSQL 8.4 has been released with its usual collection of shiny new features including Window Function support which means that you can now do OLAP with an Open Source database (How nifty is that!) All the other bits and bobs are listed on PostgreSQL 8.4 Feature List
"Program testing can be used to show the presence of bugs, but never to show their absence"
Edsger W. Dijkstra
1930-05-11 – 2002-08-06