The editor and contributors to the encyclopaedia are aiming to document everything known about the postal history and stamps of Jamaica. The project has been running since 1990 and the amount of information they have collated is a fantastic achievement. They envisage it will take a further 25 years to complete (if, indeed ever).
The encyclopaedia is highly recommended viewing and can be found here:
The site is structured well and is easy to navigate. You may come across ad-hoc pages that are under construction and awaiting content, but this does not detract from the wealth of information available and its future is exciting.