The ability to post and answer questions

Clear navigational elements relating an Answer to its corresponding Question if you're viewing just the Answer content type (i.e. you came in from google or hit node/# directly).

Here are some flow charts for users.

My comments:
I know that comments on questions is something that StackExchange has, but is it really necessary? It seems like a lot of extra flow that a user goes through to either answer a question or respond. It would help to limit the number of answers as Question comments are there for clarification purposes, but is it really so bad to just post your Answer to the Question?

Edit: graphviz source (the direction parameter is incorrect, sorry):

digraph A {
	BrowseQuestionsByTags -> ReadQuestion;
	ReadQuestion -> ReadQuestionComments;
	ReadQuestion -> PostQuestionComment;
	ReadQuestionComments -> ReadAnswer;
	ReadAnswer -> ReadAnswerComments;
	ReadAnswerComments -> VoteOnAnswer [direction="both"];
	ReadAnswerComments -> PostAnswerComment [direction="both"];
	ReadAnswerComments -> PostAnswer [direction="both"];
	ReadQuestion -> ReadAnswer;
}

digraph B {
	CompleteNewcomer -> AddQuestion;
	BrowseCaseStudies -> AddQuestion;
	BrowseDocumentation -> AddQuestion;
	BrowseSupport -> AddQuestion;
	UseSiteSearch -> AddQuestion;
	AddQuestion -> TypeQuestionTitle;
	TypeQuestionTitle -> LookForDuplicates [direction="both"];
	LookForDuplicates -> ReadAnswers;
	TypeQuestionTitle -> TypeQuestion;
	TypeQuestion -> PostQuestion;
	PostQuestion -> ReadAnswers;
	PostQuestion -> ReadQuestionComments;
	ReadQuestionComments -> PostQuestionComment [direction="both"];
	ReadAnswers -> PostAnswerComment [direction="both"];
	ReadAnswers -> VoteOnAnswer;
}

Well, mradcliffe, the thing is, some answers and questions may need clarifications, extra links/resources and personal comments.

All of those should not be an answer, as it would not be worth the points, nor could be possibly marked as "Correct Answer", and even less count on answer statistics.

I believe this is necessary, as it will incentivate users to participate without disrupting the normal Q&A flow.