Changes 9.0.5:
* Fix catalog cache invalidation after a "VACUUM FULL" or "CLUSTER"
  on a system catalog
* Fix incorrect order of operations during sinval reset processing,
  and ensure that TOAST OIDs are preserved in system catalogs
* Fix bugs in indexing of in-doubt HOT-updated tuples
* Fix multiple bugs in GiST index page split processing
* Fix possible buffer overrun in tsvector_concat()
* Fix crash in xml_recv when processing a "standalone" parameter
* Make pg_options_to_table return NULL for an option with no value
* Avoid possibly accessing off the end of memory in "ANALYZE" and in
  SJIS-2004 encoding conversion
* Protect pg_stat_reset_shared() against NULL input
* Fix possible failure when a recovery conflict deadlock is detected
  within a sub-transaction
* Avoid spurious conflicts while recycling btree index pages during
  hot standby
* Shut down WAL receiver if it's still running at end of recovery
* Fix race condition in relcache init file invalidation
* Fix memory leak at end of a GiST index scan
* Fix memory leak when encoding conversion has to be done on incoming
  command strings and "LISTEN" is active
* Fix incorrect memory accounting (leading to possible memory bloat)
  in tuplestores supporting holdable cursors and plpgsql's RETURN
  NEXT command
* Fix trigger WHEN conditions when both BEFORE and AFTER triggers exist
* more...

(adam)