I use it a lot for humorous purposes online :o) ! It is my understanding it is meant to be used in conjunction with <ins>, in which case I'm still using it wrong, as I never bother with <ins>. At any rate, also in my understanding, <s>/<strike> was always pure formatting, like <i> and <b>, whereas <del> is recognized by screenreaders? So it's an accessibility thing, which I'm all for.