Hey Waffleman,
Like what marcd2009 said earlier, use SD/SDHC to play the DLC.
Uloader - cannot use nand emulation.
Uneek - cannot use mic, .... etc
Only requirement is boot the game with 249 rev20 with 56 base. Your SDHC will be detected. You can goto the music store to d/l the free doors songs...