Doesn't work for me. Mplayer crashes when it tries to play the video. In the console I get a line that says, "MPlayer interrupted by signal 6 in module: stop_maemo_screensaver".

And a couple of lines before that I get an error about dbus: "process 1807: D-Bus library appears to be incorrectly set up; failed to read machine uuid: Failed to open '/var/lib/dbus/machine-id': No such file or directory. See the manual page for dbus-uuidgen to correct this issue. D-Bus not built with -rdynamic so unable to print a backtrace."

EDIT: I fired up mplayer from the program list, and it shows a history of files opened in it. The youtube video I inititally tried to play is listed there on my internal memory card and I am able to play it by double tapping it. However I did notice that the audio isn't quite in sync with the video.

EDIT 2: It now works fine. I forgot I was still in root when I was launching from xterm :S. I was wondering why the buttons looked un-themed and such