Elliott,
> I am not sure if it is appropriate to ask on this list if someone can
> help informing how to get the list of unclaimed domains released by
> NSI ? (not to purchase the list ! but to query the database .... What
> software should we use and what database to query ?)
This should really be in the archives for this mailing list as it has been
asked and answered many times.
You can sign up for free access at
http://www.nsiregistry.net/Tld/gltdzpro.html
You will need a couple GB of disk space (per day) and plently of available
bandwidth. Once you have two days worth of data, you can compare and find
the domain's that have been added, changed, or removed from the root zone.