Remember, first you must create a playlist with the videos you would like to show in your player. To do this, click on the videos and add them to a playlist. When you create your custom player you will be given a list of your playlists to choose from.
I have this one on the first page of my website. I'm not sure how to find it in the new menus, but if you go here http://www.youtube.com/custom_player you can highlight it as a layout style and then you'll get the embed code. Be careful, though, YouTube says: "The layout option is only available when you first create a player. Once you've chosen a layout and saved the player, you won't be able to change it."
In the bottom left corner, click on the box after the Play sign but before the Volume control and the videos in the playlist will appear along the bottom of the screen. It's a toggle switch: click on it again to make them disappear. Use the arrow at the end to see subsequent pages.
Clicking on the Videopoetry playlist will take you to a cool page in which the videos are shown in mini size in a vertical line, along with total playtime.
I am amazed to see the 13 videos I have in this playlist are a total of 41 minutes! Each one took a minimum of 20 hours to produce, and the longer ones in the 50 hour range!
Crazy what we do for enjoyment, huh?