I just finished a project with ASP.NET MVC over PostgreSQL via NHibernate. Worked great. Just out of curiosity, I actually even set it up so I could change it over to SQL Server with a config change. While it was a small and relatively uncomplicated data model (20 tables or so), it encouraged me to consider doing this combo more often. This project is hosted on AWS with AWS RDS for pgsql. Made it easy to use the basic Windows servers on AWS and not have to manage the data servers for pgsql.
