To view album art for the currently playing song tap File > Now Playing. This will display the Now Playing screen which displays album art in addition to playback position information and the current song's arist, album, and title. To dismiss the Now Playing screen and return to where you were before tap anywhere on the screen.
By default the client will automatically display the Now Playing screen when the Pocket PC has not been used for several seconds. You can turn this feature off by tapping File > Settings and unchecking "Show the Now Playing screen when idle".
As on the main control screen you can toggle the playback position text between elapsed time and time remaining by tapping on it.