I currently use PostgreSQL v8.3.3, however v8.3.5 have been available since November the 3rd. Also, PostgreSQL is only used for PokerTracker (PT3, PT2, PTS & PTO) for me.
Looking through the release notes for both v8.3.4 & v8.3.5 there are a lot of things that have been fixed and many of them are listed as performance improvements. Of course I have no idea how this affects the PTx products or if anything in these two newer versions breaks compatibility.
I find very little information on this site about if any of the products are tested with the latest version. I think it would be very good if you could have a page, in the product section for example, that list the PostgreSQL versions that all products are tested and verified to work with.
A page that list each product and then the version numbers for PostgreSQL they work with. Then of course information about how to update it to work with PTx would be good as well.