Tantric and Carl Kenner have updated their port of DOSBox. DOSBox allows you to play DOS games on your Wii.

Changes:

Home menu and on-screen keyboard (a proof of concept showing SDL + libwiigui)
Small speed increases via SDL Wii improvements
Compiled with devkitPPC r18 and libogc 1.8.0
Updated to latest DOSBox SVN

http://wiibrew.org/wiki/DOSBox_Wii