Many users have already helped us by testing Beta 3 and reporting issues they encountered with it.
Among the other issues fixed in the RC1 release are:
pg_upgrade failure on orphaned temp tablespg_restore error with standard_conforming_stringsresolving issues with SSI and two-phase commit
If you tested 9.1 features earlier and reported bugs with Beta 3 or earlier alphas, please download RC1 and test that these issues are resolved. This release candidate may be followed by one or more release candidates before 9.1.0 is released.
9.1 RC1 is being released in source code form and with packages and installers installers for Windows, Mac OSX and Linux.
PostgreSQL home page Downloads pageTesting information9.1 release notes9.1 documentation; BY TAATJENE