Backend "Who is online"
The Tools->Useradmin module now shows which Backend users are currently online.
Frontend "Stay logged in"
TYPO3's Frontend login functionality now offers users the choice to "stay logged in" for a configurable time instead of only during one session. Until now this was only possible using extensions like sg_feautologin by Stefan Geith.
To configure the new permanent login functionality for TYPO3 4.1, simply install the latest version of the newloginbox extension and adjust the options "permalogin" and cookie "lifetime" in the install tool to suit your needs.
MySQL InnoDB
Some tables are changed to use InnoDB engine type for MySQL. Unlike MyISAM, which was default in previous versions, InnoDB does not lock tables for reading when another request tries to write something to table. InnoDB makes possible many reads along with many writes, while MyISAM prevents reads and writes until every single write completes. This gives huge improvement cache_*, sys_stat and index_* tables during peak visiting hours. InnoDB is more stable than MyISAM and prevents database corruption at peaks when there are too many requests come to MySQL. If InnoDB is not configured (not enabled), MySQL will ignore these settings use MyISAM. TYPO3 users need not to change anything if they do not use InnoDB but if InnoDB is available, it will be used by default.
