[mod says] Questions and answers remain; your contributions belong to everyone and stay around to help other people in the future.
This is particularly true of questions; you would essentially be removing a whole host of helpful answers that people have put time and effort into.
This said, if you have a really convincing reason for wanting to have a something specific removed, you can email sitemods (at) fluther (dot) com and we’ll discuss it with you.
@Randy You can delete your account using the link at http://www.fluther.com/account/. Be aware that this is essentially a one-way street. Your profile will show a “page not found”, but your activity will still be visible throughout the site.