It's important to understand to scope of the work before you get started. Blueprinting is a way to detail out the work that needs to be done before development begins. Core Developers will be required to submit a blueprint for any major changes or features being added to the core code.
You can download the blueprint template package below. Depending on the code modification or creation you as the developer would like to make, you'll select either Change Blueprint Template, or the Module Blueprint Template.
This is a .zip file containing Open Office documents to give Developers a start on blueprinting their developments.
ExponentFramework.org is a portal dedicated to the development of the Exponent 2.x codeline. All activites pertaining to development of the 2.x codeline can be found on this site.
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The community website for Exponent CMS and the 1.x codeline.
Exponent's code development repository and bugtracker. Currently, only the 1.0 codeline (currently at 0.97) is available. The 2.0 codeline will becaome available in July, 2009.