PostgreSQL GDG has just released v8.0.0 of their RDMS software. Some of its new tricks include native running on Win2k, XP, and 03(no mention of NT itself, so I'm guessing not), savepoints (very, very handy in complex stored procedures), Tablespaces(think partitioning for DB systems), better buffer managment, can now change column types with ALTER TABLE, and others. They have a couple of other interesting downloads as well(GUI's, SSPL's, API's, etc.)