How can I create playlists on my computer for my myTouch 3G Slide?

I know you can create playlists from WITHIN the music player on the phone but when I had my G1, I knew of a way to create the playlist on my computer in notepad and save the file to my sd card. I’ve tried Googling it but I can’t find the how-to that I found when I did the same thing for my G1. :P Does anyone know how to do this? All I remember is doing it in notepad by listing the filenames and then saving it as a certain file…