I got the game on a whim last month, and I've honestly been enjoying myself a lot more than I expected to. I highly recommend giving it a go, as it's apparently changed quite a lot since release.
I have what should be a reuseable code for everyone to use: XET6TYJFKXA9FK6HJW43
One-use codes are also widely available at IGN or MMORPG.com
1. Create a game account at https://account.elderscrollsonline.com.
2. Activate your account by clicking the link in the activation email sent to you.
3. Return to https://account.elderscrollsonline.com and sign in with your new account.
4. On your account page, click "Redeem Code." Enter your code in the popup box that appears.
5. Once your code has been successfully redeemed, a download link will appear on your account page. Download the game and you'll be ready to play! (Note: The game can be pre-loaded from now, but will only be playable from 00:01 PST on Thursday the 10th of December).
Let me know if you hop in! You can reach me on the NA megaserver by writing to @Kondratev (the @ denotes my account name).