S&P makes a point of keeping reviewers informed about the fate of papers they review, copying them on the editorial decision, forwarding the other reviews, and letting them know if and when the paper gets published. We think that reviewers deserve to be kept in the loop. I get annoyed when I work on reviews for other journals and am not at all kept in the loop.
At this time of the year, I begin to feel the same about promotion and tenure letters I wrote over the summer. I find it irksome that departments do not let me know what happened to the cases I wrote for. Why is this not common practice?