This is basically a cleanup release for 6.5. We have fixed a variety of problems reported by 6.5 users.
A dump/restore is not required for those running 6.5.
Add NT README file Portability fixes for linux_ppc, Irix, linux_alpha, OpenBSD, alpha Remove QUERY_LIMIT, use SELECT...LIMIT Fix for EXPLAIN on inheritance(Tom) Patch to allow vacuum on multi-segment tables(Hiroshi) R=Tree optimizer selectivity fix(Tom) ACL file descriptor leak fix(Atsushi Ogawa) New expresssion subtree code(Tom) Avoid disk writes for read-only transactions(Vadim) Fix for removal of temp tables if last transaction was aborted(Bruce) Fix to prevent too large tuple from being created(Bruce) plpgsql fixes Allow port numbers 32k - 64k(Bruce) Add ^ precidence(Bruce) Rename sort files called pg_temp to pg_sorttemp(Bruce) Fix for microseconds in time values(Tom) Tutorial source cleanup New linux_m68k port Fix for sorting of NULL's in some cases(Tom) Shared library dependencies fixed (Tom) Fixed glitches affecting GROUP BY in subselects(Tom) Fix some compiler warnings (Tomoaki Nishiyama) Add Win1250 (Czech) support (Pavel Behal)