In 2008, the Digital Humanities Observatory was charged with creating an all-island gateway to Irish digital collections and resources. A key factor in the achievement of this goal was the development of the web application, "DHO: Discovery." This chapter will describe what "DHO: Discovery" was intended to be and to what extent it achieved this end. In particular it will detail the infrastructure upon which the system is based and explain how external and internal factors affected the choices made in its development. It will describe the approach taken to the data harvested for the system, recounting how it was gathered from a variety of national repositories and showing how the responses of providers to the project shaped its development. "DHO: Discovery" stresses the importance of strong metadata and highlights the importance of best practice and standards-compliant development. Through the use of internationally recognised standards, "DHO: Discovery" can be used as a basis for further development. The development of several innovative data visualisations demonstrates how some of this potential has already been realised. The design of these tools will also be described. In charting the development of "DHO: Discovery," it is hoped that lessons learnt might contribute to the future development of digital humanities in Ireland. [For the complete book, "Internet Research, Theory, and Practice: Perspectives from Ireland," see ED575997.]