Code:
http://code.google.com/p/janeek/
bootneek01.rar contains a wad. If you install that wad onto your wii, you will have a channel to boot into sneek environment.
The google custom_di svn containing the neek2o work has similar wad's. Some people have problem using those with sneek2o.
sneek2o + di has a bug. Sometimes, it won't boot and just hangs into a black screen.
Older methods are based upon replacing the sd card bootmii folder armboot.bin file.
If you have bootmii @ boot2, the wii will boot directly into sneek after you changed the file.
If your wii is only having bootmii @ ios, you will need to launch bootmii with the homebrew channel, or any other method that can launch ios 254
If you don't have bootmii @ boot2, you can use priiloader to make your wii boot into neek environment directly.