UPDATE: WII WARE/VIRTUAL CONSOLE DOWNLOADS ARE NOT TRANSFERABLE. READ MORE HERE AND HERE.
Just a heads up: new Wii Ware demos are released each Monday and they are available only for a limited time. That could mean anywhere from a week to several months. I will check each Monday and update my reviews to show if a demo is no longer available.
Another item of note: if you plan on downloading many demos, it would probably be a good idea to invest in an SD card for your Wii because you can only have around 5 demos at a time in the internal system memory.