This is a project to provide unsigned 2 byte and unsigned 4 byte data types to postgres 8.1 and greater.
The Unsigned Integer Data Typesproject is a PostgreSQL Community project that is a part of the pgFoundry.
The pgFoundry page for the project is at http://pgfoundry.org/projects/uint, where you can find downloads, documentation, bug reports, mailing lists, and a whole lot more.