Please try PostgreSQLDirect .NET 2.00 Beta version that is available for download now.
New features:
- Support for .NET Framework 2.0
- Support for Visual Studio .NET 2005 beta
- Support ADO.NET 2 features
- Support for Metadata Schemas added
- The Base-Class-Based Provider Model used
- Connection Pooling Enhancements functionality added
- New PgSqlConnectionStringBuilder component
- PostgreSQL 8.0 support added
- Support for transferring data in binary format
- PgSqlInterval type added
- Performance increased
http://www.crlab.com/pgsqlnet