There are bound to be questions that come up again and again ... some are basic how-to question (How do I submit my plug-in to the repository?) and some are more obscure question about the nature of WordPress itself (How can I use a closed-source library with WordPress?). Some of these questions will be immediate referrals to outside resources (where a quality resource is available), but should others be housed in our own FAQ?
Judging from the amount of discussion/debate/plate-throwing that goes on regarding the GPL, I see this as a potential recurring issue on the site. No one really takes a stab at answering any of these GPL-related questions in the codex, and even the GNU is intentionally ambiguous when it comes to discussing certain licensing implications.
So, are there certain frequently asked WordPress questions that we want to keep in our FAQs? What are they?
(This is marked as community wiki, so please only one response per answer).