Is this an "all things Apple" site or more specific to "power users" meaning hardware / software rather then simply "everything?"
It's anything an Apple enthusiast would enjoy, as long as it fits the Q&A format, and is on topic as defined in the http://apple.stackexchange.com/faq.
Would "what color goes best with my Mac Mini?" be an on-topic question?
Per the /faq questions should be (mostly) objectively answerable, so ... no.
What about "best places to meet other Apple users?"
A bit too localized, if you mean physically -- and "best" is very subjective, so ... no.
What is a good Apple podcast to listen to on a daily basis.
It's not a perfect question, but I think it's viable:
- it is fairly specific "podcast, Apple fans, daily"
- it is of interest to apple enthusiasts
- it's not localized (podcasts can be heard across the world at any time)