Couchbase Server 2.0's Cross Data Center Replication (XDCR) feature enables data replication across Couchbase clusters and offers innovative applications such as integration with Elastic Search. By utilizing a RESTful API, XDCR can interface with non-Couchbase systems, allowing users to create custom replication endpoints for purposes like change notifications. An example implementation using the .NET-based microframework Nancy is detailed, showcasing how to construct an XDCR endpoint through simple route and handler creation. The project, available on GitHub, demonstrates how to handle requests and replicate documents using a sample XmlReplicator class, which employs LINQ to XML for document management. Although the project provides a practical solution for certain use cases, it is noted as a Couchbase Labs project, implying limited support, and emphasizes community forum engagement for troubleshooting. A user mentions facing a replication error related to a missing vbopaque in the _pre_replicate response, indicating a potential area for further investigation and resolution.