We are happy to announce that we have now enabled interim snapshots for Connector/Net 5.1. It can be found at http://downloads.mysql.com/snapshots.php.
These will not currently update nightly. In the future, we hope to enable nightly uploads of snapshots. In the meantime, please take care when using these builds. They are snapshots directly out of our development trees and are not guaranteed to function at all. They are intended simply to give users and customers an advance look at what is coming in future released versions.