It is called PSN. PlayStation Network.
in the xmb navigate to playstation network. then find playstation store.
go to music marketplace
Yes, it's at the xbox marketplace but I don't know where to get it for ps3
U go on xbox or ps3 marketplace and buy map pack 3
go to the x box marketplace or look for skate 2 in the browse section and when you find it the pack should be in the list or for the ps3 go to the ps3 store and do the same
nazi zombies maps verruckt, shi no numa and der reise are available to download on the xbox live marketplace and the ps3 online marketplace. they are bought in map packs, and you have to pay for them
They are free. Only things in the marketplace cost money.
You can purchase through the Xbox marketplace or if you have PS3 then you can buy it through the form of purchase on there. Either way you have to purchase it.
Areas? Well then you buy doors or barriers. But if you mean map then you just download them from the xbox marketplace, PS3 community ect.
Xbox Marketplace, PS3 (idk), PC probably anywhere type Boderlands Downloadable Content (DLC for the usual xbox short)
over the PlayStation Network if you have it for the ps3, XBox live marketplace for the 360, Wii shop channel for the wii, but you can't for the PS2... hope this helps
I'm sorry to say that is not possible. However, you could buy the GTA: Episodes of Liberty City and get both The Lost and Damned and The Ballad of Gay Tony. An alternate way would buy to get on your console marketplace (Steam, Xbox Marketplace, PSN Store) and buy it from there. I don't know much about other consoles, but on the PS3, you can purchase the GTA Episodes for $19.99