I just read this question, which seems like a reasonable question.
The first answer posted also seems like good response, which I was about to vote up on, when I noticed that it was both posted at exactly the same time as the question and had the same author as the question as well.
The policy is that answering your own questions is encouraged, which is all well and good, but feels to me that in this case it defeats the purpose of the Question & Answers format. It is not so much that after asking the author did further research and/or that the comments and other incomplete answers lead to a genuine solution which the author was good enough to share.
In this case there appears no genuine question in the first place; the only reason the question seems to have been asked is to allow the author to post his answer.
I have commented, down voted and voted to close on other occasions with the remark if you want to document your own learning experiences you should write an article on your own blog instead.
But what is the policy or conventional wisdom in these cases?