The JDBC driver for PostgreSQL is integrated in Netbeans 6.5. It is located at:
As you can see it is pretty much upto sync to the latest (about a rev back since the latest is 604 build). Clicking the Services tab of Netbeans shows Database where a new entry can be created using using the "Direct URL Entry" using the format as follows:
providing the user name and password for the connection and then the schema name (hint: public schema) in the Advanced Tab and press OK to create a new connection to PostgreSQL database.
Once connected clicking the expand sign which looks like o- can be expanded to see the Tables/Views/Procedures and more expansions can be done on Tables to see data either using menu options or using the SQL Editor.