Stars can be gained by registering Nintendo products online and purchasing a Wii.
Eurogamer reported yesterday that European Wii players will be able to use Stars to redeem Wii Points for Virtual Console use. Stars are points that accumulate on a Nintendo-Europe.com account when a player purchases Nintendo products and registers them online. EuroGamer says that Stars even come with your purchase of a Wii, and can be gained by purchasing Virtual Console games and taking a short survey.
Nintendo encourages users in all regions to register their products online, but so far only Nintendo of Europe has translated this registration into a benefit with monetary value.