It's been awhile!
Link to a presentation on the recently constructed (September 2012) porous pavement retrofit project in Arlington, MA. The goal of the project was to provide water quality improvements for an existing parking lot adjacent to a waterway.
Cross-sectional View of Porous Pavement System used at Hurd Field
Source: http://www.epa.gov/mysticriver/porouspavementproject.html
Good start to finish type presentation with useful data as well as nice photos to put things into perspective. I liked the last bullet on the presentation: "Pre-design - good understanding of soil mechanics and engineering (if incorrectly situated, performance and reputation suffer)".
Very true and highlights how important site selection is. In addition to site selection and a good understanding of the subsurface conditions, it is important to have a grasp on the anticipated traffic volume, anticipated vehicle types and loads, etc. to spec the proper mix as well as determining the porous pavement thickness. Then, it's all about the maintenance!
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