In de changelog ( http://freshmeat.net/projects/mysql/changelog/ ) staat het volgende:
Changed ALTER TABLE to create non-unique indexes in a separate batch (which should make ALTER TABLE much faster when you have many indexes).
Added delayed index handling to LOAD DATA INFILE, when you are reading into an empty file.
ALTER TABLE now logs the first used insert_id correctly.
Fixed crash when adding a default value to a BLOB column.
Fixed a bug with DATE_ADD/DATE_SUB where it returned a datetime instead of a date.
Fixed a problem with the thread cache which made some threads show up as ***DEAD*** in SHOW PROCESSLIST.
Fixed a lock in our thr_rwlock code, which could make selects that run at the same time as concurrent inserts crash. This only affects systems that don't have the pthread_rwlock_rdlock code.
When deleting rows with a non-unique key in a HEAP table, all rows weren't always deleted.
Fixed that BDB tables work on part keys.
Added CHANGE MASTER TO command
Fixed fatal bug in LOAD TABLE FROM MASTER that did not lock the table during index re-build
LOAD DATA INFILE broke replication if the database was excluded from replication
More variables in SHOW SLAVE STATUS and SHOW MASTER STATUS
SLAVE STOP now will not return until the slave thread actually exits