Seems like OP needs a simple solution.
PS3 Media Server + Wifi Router = Stream (Or wired)
You can download the PS3 Media Server here:
http://code.google.com/p/ps3mediaserver/downloads/list
Install the PS3 Media Server, run it, (no config necessary), turn on your PS3, navigate to the video via PS3 and play.
It'll transcode and all sorts of awesome shit when OP decides to go down that route.
Done.