TikTok 'n' Botch Released the binary data for other people to look at( dumps from the Twilight Hack). So if you are interested here you go:
http://rapidshare.com/files/91218358/Twilight_hack_binary.rar.html
that file includes:
Twilight hack binary.nfo
initloader.bin
loader.bin
Also the official Wii SDK is not used for the wii homebrew yet, however open source tools are used to develop applications to use with the ELF compiler. As stated earlier ELF files can be used and executed on the Wii. More development kits to use : devkitPro and libOGC.
devkitPro 0.3.4- http://www.devkitpro.org/
to download it and check it out : http://sourceforge.net/project/showfiles.php?group_id=114505&package_id=199021&release_id=552359
version 0.3.4
For the libOGC use the support forums: http://www.tehskeen.com/forums/forumdisplay.php?f=86
