PSP and 360/preloaded stuff

I was wondering b/c i am prob gettin elite, i heard that the 360 supports the PSP (like you can put pics and stuff on ur 360 throught the 2.0 USB from the psp. i download movies onto my psp memory card so could i transfer thos evideos onto the 360 hardrive to watch (can i even transfer videos onto it or do i have to download videos/movies/tv shows from live marketplace. **also, does the elite come with 17 gb of demos and trailers and stuff already on it? i heard about that