Firstly, you can have your entire drive set to fat32 and play emulators and wii games off of it. Check the fat32 link in my signature for instructions. Secondly, you really don't want too much on your wii nand, but you should look up forwarders. You can have your apps on your HDD as you would have them on your SD card. They just need to be on correctly named folders for the forwarders to pick them up. You can basically have everything on your HDD if you choose, but it needs to be fat32.