Once a question has been answered, it seems daft to delete it - especially if other people would find the answer useful.

I see discussions being deleted all the time - we get email notifications of a post, click it, and see it's no longer there.

I personally think it's a bad thing. If you've posted something you shouldn't, it's really already out in the public domain. It's probably in google cache for the next 50 years, and it's in my mailbox so I'm sure it's in others. As Ian pointed out, it's a bad thing to be able to delete an answered question, or even one that you have resolved yourself whatever the resolution is to your problem - even if you realised you made a silly mistake that led to your post, it's valuable for others to be able to see the outcome.

Aaron

That seems a sensible policy.