Translations. It’s necessary to have translations. Meteor itself is super easy to get along with, but the English docs made it difficult to learn Meteor. I’m a Chinese, I have some misunderstanding while reading the docs sometimes, once even annoyed me for a week. Translations can be made by community, and we should come up with a platform that can make translating easy now.
Detailed posts. We now have lots of excellent (blog) posts explaining more about Meteor. We just need to attach them to the docs.
Comments. It’s useful to build a commenting system with something like SideComments, which can allow us to comment on some lines. Comments can be something we should pay attention to while developing, explaining the internals, and more.