Well, you could always just stop coming?
If you really want, it is easy for us to delete your account to prevent you returning; however, we would prefer not to delete your content (unless there is a strong whiff of "troll"/"spam" about you). In particular, that content is already covered by cc-wiki, and is probably available both in google search results and in the public db dump.
We'd also prefer not to remove (for example) accepted answers; if the answer is good, it should stay!
Here's an option if you want:
- edit your profile and change your display name to be "somebody" or something
- then flag a moderator (or e-mail the team) and ask your account to be deleted but keeping the content; easily done, but we'll probably ask you to verify your account, for example by adding "yes Marc, it is me" to your profile (or similar) or by e-mail, or both (and yes, we can see old e-mail addresses too; so hijacking an account can't destroy all trace of an original e-mail address)
we can then (in theory) drop your account. But we'll be sorry to see you leave, and I really don't want to do this (I haven't deleted a "bona fide" user to date...). Please stay ;-p I'd also probably double-check with Jeff before I start doing this!
One caveat: all negatively voted posts are automatically deleted when dropping a user account, even if we choose to keep the "good" content.