I have an article on corporate apologies in the latest issue of Ampersand, Hill & Knowlton's online "magazine".
This is my third piece or post on the subject, and although the argument will have a long shelf-life, I suspect I should give it a rest. I will end (well maybe) with a quote from my H&K colleague Chris Gidez who takes a somewhat different approach to the issue in a post from earlier in the year: "But at the end of the day, such an expression (apology - my note) is nothing more than a Band-Aid. It doesn't cure the ill."
If you come to the issue of corporate apologies from the perspective of ethics, can I also recommend you take a look at the article in the same issue by Stuart Smith and Carole Essex on the sustainable enterprise.