PostgreSQL and .NET (Entity Framework and all)

Npgsql is the way to go:
http://npgsql.com/index.php/2008/11/npgsql-version-2-full-support-for-net-35-and-entity-frameworks/

PS: another great find (I think) :
http://npgsql.com/index.php/2009/08/how-to-set-up-entity-framework-npgsql-part-1/

Especially like that you can use EdmGen2 to update your edmx files from the command line (like sqlmetal but for ADO.NET entity framework)



Enjoy!