The desire to integrate a memorial into the planning of both the WTC site and lower Manhattan means more than resolving the competition with development for space at the WTC site, and more than identifying a single space for contemplation, reflection and remembrance - or the incorporation of a memorial program-related structure such as a museum or institute.
Similarly, integrating the memorial experience into all of lower Manhattan, if this becomes a goal, involves broad array of issues: the potential desire for several sites; view corridors to memorial sites; the nature of the pedestrian experience as one approaches the memorial(s) and other, subtle ways in with the memorial may be revealed. Other issues include the scale, location, and uses of buildings on the site and their relationship to existing or proposed open spaces - and, of course, the question of whether and what kind of towers should be built on the site - which you can have your say about on the forums.