The Stock player that comes w/ the phone should have a resume feature (It does for me) But I did notice that the audio was either delayed or the video was delayed. They didn't match up appropriately. Not sure if it was the video I put on itself, or the app that was running it.
I just thought of trying out doubletwist...and it seems to give me the option to resume. Will have to test later for quality of video and sound with it.