how do you know what year is good?

[curious]

Thanks IK, went and checked out some sites, and bookmarked them.
Now, another question in that area.
I see that they have the names of variety of grapes, Chard, Zins and such, but not specific vineyards, how do you know one is better over another? Word of mouth?

Sorry to have so many questions, classes start in a week, will be too busy then to post, just lurk.