I recently came across this:

http://meta.cs.stackexchange.com/questions/599/reference-answers-to-frequently-asked-questions

and thought it would be a good idea to introduce something similar here. Do you agree? If so, what should the categories be?

Here are some provisional categories:

# How Ethereum Works
What it is and how it works.

# Contract Development
Basics of contract development and deployment.

# Testing
To do with testing frameworks and systems.
1. Simulated blockchain
2. Private network blockchain
3. Public testnet