When I decided to no longer maintain my WP-Cumulus plugin a while ago, one of the reasons was that the project was in disarray. I wanted to improve so many things at once, that I ended up finishing none. One of the plugin’s parts however, the actual Flash movie, was 99% done. That’s why I’ve decided to put it on Github.
Note that this is “Cumulus”, without the “WP-“. It’s a new version of the movie, that uses a different, more generic XML format, and supports new things like unicode and device fonts. It’s not a WordPress plugin. If you’re looking to revive WP-Cumulus or incorporate the effect into other projects, it’s the ideal start. It’s the best incarnation of the effect, and I invite you to write stuff around it.