Does the Pocket MVP have that feature?
Can it rotate the image 90 degrees on its side like the WMP?

I've encoded a movie at 320x184 and I want to see if it'll display.

another questions, does the MVP add masks for video if the picture is encoded for a wide-screen aspect ratio?

Yes PocketMVP will rotate your video for you and yes it will have the black border in wide screen , if thats what you mean..

Apple iPhone
iPod Nano 8 Gig (Red)
iPod 30 Gig (Video)
Axim X30 High
DSI Aluminum Case
Lexar Secure Digital 256MB
Kingston 512MB My Encoding Guides

Thanks.
I really should learn to explore all the functions.
Just noticed the what the buttons on the bottom did.