So not that anyone is still running an old version of software out there like Websphere Portal 5.1. But if you have any doubts or concerns, then this is the page for you.
http://www-01.ibm.com/software/support/lifecycle/
Thanks to Craig Pessman for the link.
It is important to note that anyone on WebSphere Portal 6.0.x or WCM 6.0.x have only until April 30, 2012 to upgrade if they want to stay supported. Since these migrations can easily be 2+ mos, depending on the complexity, now is the time to start planning those upgrades.