TLDR: It's a little pixel tracking server that aggregates hits in memory and flushes them to your web application with an internal REST call. Useful if you have

TLDR: It's a little pixel tracking server that aggregates hits in memory and flushes them to your web application with an internal REST call. Useful if you have lots of traffic on static pages, and need tighter integration with your application than Google Analytics can provide. Some more links, for the curious: Annotated source code: http://documentcloud.github.com/pixel-ping/docs/pixel-ping.html http://documentcloud.github.com/pixel-ping/docs/pixel-ping.h... Announcement blog post: http://blog.documentcloud.org/blog/2010/09/code-drop-pixel-ping/ http://blog.documentcloud.org/blog/2010/09/code-drop-pixel-p... ProPublica's reference implementation: http://www.propublica.org/nerds/item/pixel-ping-a-nodejs-stats-tracker http://www.propublica.org/nerds/item/pixel-ping-a-nodejs-sta...