Last night, I received an email from u2.com, stating that, since I am a former Propaganda subscriber, my code would be reset and I would be able to use it during the presale this week, even though I had already used it in previous presales. My SO got one of these emails too. We were quite tickled, as you can imagine.
This morning, we both tried for MSG tix, only to put in our codes and have them rejected as having already been used. I just tried using my code for Salt Lake and got the same message.