It looks like the outcry worked. Science is going to stick with JSTOR. This is good news. I am sure that the AAAS would have done a fine job of archiving the journal Science, but having it in JSTOR strengthens that archive and it is a strike against the proliferation of single journal or publisher archives which makes the lives of users (and librarians) easier.
I wrote about this back in July 2007 I am glad to see they changed their minds.