Custom Video playlists for MySpace are easy to build using Embedr.
First build the playlist like you normally would.
(Check the help section for details)
Once you've built your playlist, click the MySpace buttom near the embed code. You will be prompted to sign in and select if you want the playlist inserted into a blog post, bulletin, or the about me section of your page.
You can also copy the playlist embed code and paste it into whatever section of the MySpace page you want.
Don't forget, you can also change the color, size and format of the player for your page before you embed it by clicking "Customize"