The website is the old version of James Porter's Projects and Writings. You can find the new version here.
Solandra is my open source framework for creating algorithmic art (it would also work well for data visualisation) and I've updated the 'art' section of this website with a lot more Solandra content.
There are now several full tutorials, links to the main Solandra site and some information on how to get started.
I've also begun a Daily Sketches site. An open source version of this is ready to adapt as a template project on GitHub, if you want to set yourself the goal of creating one algorithmic sketch per day. This was inspired by Saskia Freeke's ongoing project.