[eluser]WanWizard[/eluser]
[quote author="skunkbad" date="1275951183"]$_SESSION (by default) destroying itself on browser close is just one example.
Why try to improve something that works perfectly?[/quote]
Depends on your definition of perfectly.
I personally can't appreciate it when a server makes decisions for me. And I have plenty of examples where destroying the session on browser close is not a good idea...
With the session library I can decide (or in this case the admin of our CMS) when to have the session expire.