Update: It seems that PSN is back up and players should be able to get back online.
It seems that PSN connectivity issues continue for Sony. On Sunday there was the DDOS attack, Monday had a brief schedule maintenance, and here on Tuesday it seems that PSN is having some problems. The official PlayStation twitter account sent out a message today about the issues plaguing PSN.
There is no word yet if the people responsible for Sunday’s DDOS attack are behind what is currently going on or if these issues are just a isolated incident.