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
"The less you can live on, the more chance your idea will succeed. This is true even after you’ve 'made it'."
Hugh Macleod