2KA,

I'm about to announce a web page that converts FAA National Flight
Database (NFD) files into both of the airspace formats you describe
(Tim Newport-Peace and OpenAir(tm)). It also provides a KML version
for viewing the airspace in 3D with Google Earth.

I'm not familiar with the NASR files. The NFD is subscription only,
and it is because of FAA requirements for maintaining the subscription
that I'm charging for it on my webpage ($20/year).

Users will be able to provide a Cambridge-formatted turnpoint with
which to specify their area of interest, or provide latitudes &
longitudes for the bounding rectangle.

Look for the announcement in a few days.

~ted/2NO