I've been tryin to find out for a while if you can copy an app/emulator (i.e snes9x) from your SD card and place it permanently on the wii or in the Homebrew Channel, is this possible? Or is there an other way of getting the apps permanently to the Wii?
Technically, if you built your own banner (from scratch), and compiled it and the respective homebrew app into a WAD file, you could then use a WAD installer to put it on.
The Homebrew Channel only ever looks at the SD card, so as long as it is on there, it will appear on your list.
The above is correct only if you haven't installed the most recent update. If you have, you can't install WADs (i.e. channels, with the exception of HBC) at all until someone releases a new installer.