Wow. I myself don't have this answer but this has to be one of the best questions from a newcomer in a while. I wouldn't classify it as a "newbie question" as you put it because I'm sure that there are a lot of us "veterans" of the PS3 that need to do some digging for this answer. You definitly have my curiosity peaked. If I understand your question correctly though, you want to transfer dvd/bd files from your pc to PS3?

Nec

EDIT**

I did some searching and it seems the only way to connect to your pc without the use of removeable media is to use a program that makes your PC a server so the PS3 will recognize the files on the pc. See the link below for an idea of what I am talking about.

PreGameLobby - Transfer files freely between PC & PS3