XBOX Live has better security, but you have to pay. PSN security is lower, it's free.
The PSN had a security breach in 2011. The downtime started on April 20th, and ended as PSN access was restored on a region by region basis starting from May 15th.
While no information has been made available by region service is to begin in Early May 2011 according to the related links and questions from information provided by Sony they are also offering bonuses for the PSN customers
the time psn will be back on is not known and not predictable, the network needs critical security repairs Sony indicated services are ready to begin coming on by regional area the 1st week of May 2011
Pretty much, nothing being that PSN has no security what so ever.
The PSN is currently down due to a security breach last week.
No, a Japanese PSN account can only be funded with a Japanese PSN card, one with a yen amount on it.
It's actually known as a PSN ID. http://www.us.playstation.com/PSN/mediago
The PSN is still down due to a security breach, but when that's back up, you should be able to use that as well as UMD.
The PSP-3000 can access the PSN, yes.
by PSN you need a account to PSN
WHAT DOES PSN STAND FOR OR MEAN