As posting setups was mentioned being useful, here is mine:
###[Q]App recommendation
Please note that recommendations like *Is there an app for X* are off-topic here (see [What topics can I ask about here?](http://$SITEURL$/help/on-topic) for details). For where your question might fit better, you might want to look into [Where can I ask questions that aren't Android Enthusiast questions?](http://meta.android.stackexchange.com/q/371/16575)
###[Q]Development question
This site is for users of Android, which means that questions about development/programming are off-topic here (see [What topics can I ask about here?](http://$SITEURL$/help/on-topic)). Development questions are on-topic on our sister site [Stack Overflow](http://stackoverflow.com/questions/tagged/android).
###[Q]More than one question asked
The question-and-answer format of this site works best if you put each question in a separate question post. Please edit your post down to one question, and create new posts to ask any further questions. You'll get better answers that way.
###[Q]OP providing facts in a comment
The best way to add additional information to your question is by editing it, with the **edit** button. It is better visible that way, and comments are mainly for secondary, temporary purposes. Comments are removed under a variety of circumstances. Anything important to your question should be in the question itself.
###[A]OP adding a new question as an answer
Remember this is a Q&A site - so keep on editing your question with new information - this section is for actual answers. If you have another question, please ask it by clicking the [Ask Question](http://$SITEURL$/questions/ask) button.
###[A]OP using an answer for further information
This is a question-and-answer site, not a forum. Please use the **Post answer** button only if you have a solution to the problem, so that other users can see your question is not yet answered. You can click **edit** on the question to add more information to it.
###[A]Answers just to say Thanks!
Please don't add "thanks" as answers. Invest some time in the site and you will gain sufficient [privileges](http://$SITEURL$/privileges) to upvote answers you like, which is the $SITENAME$ way of saying thank you.
###[A]Nothing but a URL (and isn't spam)
Whilst this may theoretically answer the question, [it would be preferable](http://meta.stackoverflow.com/q/8259) to include the essential parts of the answer here, and provide the link for reference.
###[A]Comments as an answer (new users)
Please don't add comments as answers. Invest some time in the site and you will gain sufficient [privileges](http://$SITEURL$/privileges) to upvote answers you like, or to add actual comments when seeking clarification of any issues.
###[A]Comments as an answer (experienced users)
Please don't add comments as answers. Use actual comments when seeking clarification of any issues.
###[A]Answer that is a question
If you have another question, please ask it by clicking the [Ask Question](http://$SITEURL$/questions/ask) button. Include a link to this question if it helps provide context.
###[A]Requests to OP for further information
This is really a comment, not an answer. With a bit more rep, [you will be able to post comments](http://$SITEURL$/privileges/comment). For the moment I've added the comment for you, and I'm flagging this post for deletion.
###[A]Another user adding a 'Me too!'
If you have a NEW question, please ask it by clicking the [Ask Question](http://$SITEURL$/questions/ask) button. If you have sufficient reputation, [you may upvote](http://$SITEURL$/privileges/vote-up) the question. Alternatively, "star" it as a favorite and you will be notified of any new answers.
Entries #1 & #2 are specific to Android Enthusiasts, but similar cases might exist on other stacks, too.