A thought-provoking piece by Morten Rand-Hendriksen on why post formats belong in a plugin, rather than in WordPress core.
Currently Post Formats themselves remain as a core feature and there is sporadic talk of restarting work on the Post Formats UI. I question it’s valid claim as a core feature and propose a radical shift and a rethink: Redefine post formats and their function, draw up strict guidelines, and move the entire feature into a plugin.
A central piece of Morten's argument is the question “Should a bloggers-only feature be a core feature in WordPress?” Obviously, he's arguing that it shouldn't. I don't know if I agree with Morten on this, but it is definitely an interesting post, and something that warrants further discussion.