You may want to take a look at WiiLoad or Sendtowii. I haven't used either of them myself so use with care.
Wiiload - WiiBrew
Wii Homebrew: Wiiload simplified 2.0 | WiiNintendo
Is is possible to download Wii Channels like the Internet Browser etc on PC and transfer them over to the Wii.
for wads yes and one channel you could do that homebrew channel