I finally got time to publish a round of StackBuilder package updates, as well as publish a new package - Npgsql 2.0.4. Npgsql is a mature and well maintained .NET data provider that works with Microsoft .NET and Mono. More information can be found on the project's pgFoundry page and website.
Npgsql 2.0.4 is available through StackBuilder for Windows, Linux 32/64bit and Mac OS X.
Other updates to existing packages for all four platforms are: