The Reconfigurable Computing Cluster project has been investigating broad question of what, if any, role FPGAs may play in parallel computing. While this article does not answer that question but describes the experiences thus far. The main vehicle for research has been Spirit, a small-scale experimental machine consisting of 64 FPGAs connected in 3-D torus. It has been at the core of several focused studies. This article provides a summary of the architecture, the scientific and pragmatic discoveries enabled by the machine, and two more FPGA-based parallel computers that are presently under development.