This is a feature that we've thought about for a very long time... we decided not to implement it in the redesign because we didn't want a malicious user to be able to post something and then change their answer to, say, something very different.
The ability to really check your answer before you post was the impetus behind Live Preview, though that feature has gotten mixed responses. What are your thoughts on that?
And, if a good number of people in the collective feel that this is a very important feature, we'll definitely prioritize it.
@mirza: Can you point me to that on Facebook? I've never been able to edit any of my PMs or wall posts.
@perchik: We do have a few things on the burner, but we're making progress on a bunch of them. Have you seen the blog? http://www.fluther.com/blog/