Wii Gets Custom Firmware, Purported PSP Emulator
Engadget is reporting that some recent unofficial Wii modding news has had a couple of interesting breakthroughs. First, it seems that a team has released what is being called the "first custom firmware for the Wii" that supposedly allows writable DVDs to be read in emulators. Second, the folks from TeamShift have shots of a "working" PSP emulator for the Wii. Unfortunately "working" only means between 4 and 8 frames per second, so still a long way from playable.
I'm not sure what you're waiting for. With the Homebrew Channel, you can start ScummVM directly from the Wii Interface. The only tricky part is getting the HBC installed and there are plenty of tutorials for that.