Riivolution is an on-the-fly game patcher for use with retail discs. It allows users to place content on their SD or USB devices, which will be read by the game during regular play.

It can be used for custom textures, music, levels, memory patches, game translations, and more!

Changes:

System Menu 4.3 compatibility
Wii slot light filesystem indicator
Stability fixes for all filesystems
Files close after a few seconds to allow them to be replaced over RiiFS
Improved channel install
No longer requires SD/USB
RiiFS improvements
Native C++ Server
Connects automatically on a LAN without needing SD/USB

Thanks to http://www.nintendomax.com/viewtopic.php?t=11976&f=54 for the news.

http://www.wiibrew.org/wiki/Riivolution