The PSP movies provided on Newgrounds are in a PSP-compatible MPEG-4 format (.MP4). They are not true Flash Player files (.swf), so their visuals will not be vector and they won't be interactive in any way.
I know Flash very well, and have owned two different versions over the past two years (5 and 8), so once we get the completed Flashplayer totally done for PSP, I'll be one of the first to be spewing stuff out that'll work with PSPFlashplayer's syntax. ;]
Once Flashplayer is fully ready on PSP, you won't be able to get Flash Player files from Newgrounds, because they now have an anti-bandwidth-stealing system up that makes it so when you download an SWF from them it'll just link you to NG.
Eventually, when Flash Player is fully operational for the PSP, you will be able to use SWF's, and the easiest way to get them is this:
1. Go to a site with Flash movies like albinoblacksheep.com or flashplayer.com.
2. Open a page that has a Flash movie in it.
3. File>Save Page As... (Ctrl+S in Firefox) and save it to your desktop.
4. Go to your desktop and look for a folder with the name of the page you just saved and within the folder, there should be an .swf file of the Flash movie that was on the page.
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