I have two Playstation network accounts, one to download american stuff and the other for japanese stuff.
PSN America: Yuna00
PSN Japan: DiMenezes
I'd say I use them both pretty much, but I'll use the Japanese one more to play games, because since I have both US and JAP games I decided to play US games in the US account and the same for the JAP account. But I have a little more internet friendly JAP games than US.
Anyway, I have: Resistance 2, Soul Calibur 4, Metal Gear 4 (JAP), Resident Evil 5 (Which is JAP but can play from people anywhere) and the other games are mostly offline stuff.