I see the various guides around here installing wiiflow, and notice the channel wads they have is for older version than the newest at Downloads - wiiflow - Project Hosting on Google Code
The downloads there look like they only have a forwarder, which as I read other posts, you need the SD card in the wii for it to work.
I did run a channel wad and it worked off the USB Drive without the SD card, but games like Mario Bros Wii didn't work.
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