On three separate occasions over the past two weeks, I’ve received questions through the Ask Me section of this site without including a way for me to contact the requester.
I like to leave the option open for people to supply contact information at their discretion, rather than making it a required field. This also allows people to enter alternative contact methods such as Twitter or instant messages. It also ensures that if the question is of a generic nature, I can reply publicly as a post, rather than directly contacting the person posing the question.
However, to those who posed questions over the past two weeks or so, if the question is of a more direct nature, I would strongly encourage adding a point of contact (even if you just supply a temporary email address), so that I can appropriately respond and personalize the response to you.