http://www.nintendo.com/zeldaclassic/
The above link is info on obtaining the Zelda Bonus Disc. For people who fear links, here is the lowdown:
There are three ways to get the bonus disk, and all involve you buying stuff (Obviously; this is a promotion after all :P )
1. Buy a gamecube with the Zelda Bonus Disk sticker on it. This is the one everyone has heard about. Simple enough.
2. Order a subscription to Nintendo Power. 19.95 for one year, and you get the disk mailed to you free in about 2-3 weeks. NOTE: This offer is ONLY available online!!!
3. Buy two of the following games: Mario Party 5, Mario Kart: Double Dash!!, Mario & Luigi: Superstar Saga and 1080° Avalanche. The way this works, is these games will come with PIN numbers inside; Register two of the PIN numbers plus your gamecube's serial number (The DS number on the bottom of the GC; NOTE you have to do this again even if you've already registered) to receive the disk.
Some additional info for everyone: This promotion is of course designed to promote Nintendo's holiday games, but it's also designed to promote two other things that are only briefly mentioned in the promotion: Online game registration and MyNintendo.
MyNintendo has been around for awhile. It's actually a pretty powerful tool for Nintendo diehards. You can track info on Nintendo games, update your personal information (address, mailings, etc.), Track order status, repair status, register for warranty purposes, and if you have a subscription to Nintendo Power, you can access chatrooms, send yourself missed issues, etc. Nintendo will begin pushing MyNintendo pretty heavily soon. Expect a Nintendo site redesign as well as 'community' features popping up (Forums, contests, etc.) in the next few months.
The online game registration is new. So new, in fact, that Nintendo isn't exactly sure what it will mean to register games. What is known is that people who have MyNintendo accounts will have access to Nintendo exclusive content and contests. I also know that buying more products does not mean that you are more likely to 'win' or curry favor; being an active community participant will. I also don't know if the PIN numbers will begin showing up in all of Nintendo's games or if this is a temporary promotion, but I do know that Nintendo of America IS NOT planning a points system ala the power points program in Japan or the Stars system in Europe. I don't know what other things will be changing, but if people are interested I'll update as things happen.