'The latest', always.
You don't 'update the PSN', you update the PSP's firmware from the Settings menu on the XMB.
Yes all you need is a psp
yes it can as long as you update it
You can't delete playstation network from a psp.
Because it updates the PSP not the network.
you have to update your psp until you reach 5.00
you sign up and it's free on a psp
It has a variation of the PSN. However it does not have the extensiveness that the PS3 Network has. I believe you can only do things through games. for example SOCOM, all your friends were stored on the servers and such when you log on the game. Now the PSN stores everything on your ps3, making it more like a computer and less like web-tv, if that analogy serves its purpose. =P
yes
Yes it is
update to 3.5 on psn
The Playstation Network does not charge, but you still need internet service