The second beta release of PostgreSQL 9.1 is now available. This beta fixes several issues reported with 9.1 beta 1. All users should help the project by downloading and testing PostgreSQL 9.1 beta 2 as soon as they can.
Many users have already helped us by testing Beta 1 and reporting issues they encountered with it. The most significant of these issues caused Windows versions of PostgreSQL to segfault when trying to process datetime
input strings containing keywords such as 'now' or 'infinity'.
Among the other issues fixed in the beta2 release are:
Numerous issues related to per-column collations
Numerous issues related to Serializable Snapshot Isolation
Fixes to new pg_ctl modes
Making pg_upgrade work with all new 9.1 features
Fix ability to build PostgreSQL under MSVC
Problems with domains over arrays
Problems with unlogged tables
Changes in "peer" authentication over Unix socket connections
Assorted fixes in plperl
Documentation additions and improvements
Translation updates