Svpe has been using the recent developments of the socket interface and have created a loader that loads stuff over TCP.
It is a TCP server running on the Wii that listens on port 8080 by default that will run any binary that is sent to it. Both DOL and ELF executables are supported.
A working windows gui has been written by henke37 and dasda and is avalible from henke's site. The Wii server part is included.
You currently need libogc cvs and bushing's socket patch in the sf.net patchtracker to compile this yourself from the source code.
The client first sends the length of the file to load in big-endian and then the data of the file. There is no traffic from the server.