Pap the iPod idea will not work it says on the line that it manages files on a SD card not an iPod.
Okay the app is a demo boo, it costs 19.00 to purchase.
Media sharing: makes a small web server using an IP address that you require the internet channel and you need to type in your router's IP address and :9000 (example 192.168.1.1:9000) the :xxxx number can be changed by changing the sharing port in the preferences.
Movies: Same as above except you queue in what movies you want to play via the media share.
Music: Same as movies except tied to your itunes.
Pictures: Same as movies
Saved Games: All it does is copy your Wii Folder from your SD card so you need to copy everything from Wii to SD and then to your Mac, you don't even need this application except it helps you organize a tiny bit better, each game save and file save on the SD card will already have a timestamp that your Wii put on it.
Miis: Transfer Miis from your Wii remote to your Mac via bluetooth.
So all in all, it's just a internet streaming program and the saved game functions you can already do by yourself by dragging your Wii folder from your SD card to your computer harddrive.