Due to positive feedback to my sparkplot post, I registered sparkplot.org and made it into a home for the sparkplot module.
I also added another option to sparkplot: -t or --transparency. Setting this option produces a transparent background for the generated PNG image (thanks to usagi for the suggestion).
I was glad to see somebody actually using the sparkplot module at the T&J blog. It looks like visualizing trading data is a natural application of sparklines. I also liked the term used by T to describe the act of embedding sparklines into blog entries: datablogging.