i am rooted and i have everything on there. all kinds of folders that randomly appear cuz i dont know how this **** works i just do whats suggested. it would take me hours to type whats on my sd card. If i have to type it all i will
If you have droidmod or any droid mod file delete it.
any previous roms that you downloaded delete.
See as long as you have a nandroid backup you should be ok.
Also you can copy your entire nandroid folder on to your computer desktop. Then on your droid delete all nandroid files except the last two you have made.
in your download(s) folder if you have any old apks (ie keyboards, apps) and you no longer need it delete it.