"Dataspace: The Final Frontier" is a comprehensive collection of expert contributions documenting the proceedings of the 26th British National Conference on Databases (BNCOD 26). This conference took place in July 2009 in Birmingham, UK, and offers deep insights into current research topics in the field of databases. The publication includes 12 revised full papers, 2 short contributions, and 5 poster presentations, selected from a total of 33 submitted works. The contributions are organized into thematic sections addressing key aspects such as data integration, data privacy, alternative data models, query methods, as well as data mining and the processing of stream and event data. Additionally, the book contains two introductory talks and two tutorial papers that provide valuable perspectives on the topics discussed. This collection is a valuable resource for professionals and students looking to engage with the latest developments in database technology.