The blood center is at 67th and 1st avenue; the hospital we gave at is at 66th and York; her apartment building is in the mid-80's and 3rd avenue.
Finally, this last map is of the village. Earlier in the afternoon I walked down to Houston and Broadway from 17th and 1st, and then walked west along houston until I got to Pier 40, on the water. Then I walked back up to 23rd and 5th.
Oh, and if you want to see the WTC on these maps:
All maps and links on this page are from http://www.nycvisit.com/.