The definitive one stop information center for MS-SQL -> PostgreSQL migration.
The MS-SQL Migration helperproject is a PostgreSQL Community project that is a part of the pgFoundry.
The pgFoundry page for the project is at http://pgfoundry.org/projects/sql2pg, where you can find downloads, documentation, bug reports, mailing lists, and a whole lot more.
This project is still in the process of being set up. However, even before this project came about, there already was some very good documentation on Techdocs:
