The following link has 216 of the 261 drawings included in the March 2007 release. This site also has a multi-resolution drawing viewer that provides a user-friendly way of browsing the drawings.
Tower Blueprints available for download or study here:
http://911research.wtc7.net/wtc/evidence/plans/table.html and here: http://911research.wtc7.net/wtc/evidence/plans/table.html
Multi-resolution viewer for World Trade Center Drawings here: