Metabrainz is the charity that oversees Musicbrainz, a free/open music metadata service that has gained in popularity since Gracenote took all the audio metadata its users keyed in by hand and enclosed it, denying all but the top bidders access to it. Musicbrainz is free to use, but has a premium, higher-availability service for commercial operators, like Amazon.
For three years now, Metabrainz has been chasing an unpaid invoice at Amazon. Metabrainz is a tiny, charitable nonprofit that relies on grants and donations for the majority of its operating capital, but commercial operators are also key to its survival. And Musicbrainz is an integral part of the plumbing of the Internet at this point, a powerful check against one player achieving dominance through a chokehold on a key resource.
So Metabrainz sent Amazon Headquarters a birthday cake, celebrating the third birthday of good ol' invoice #144. As a volunteer board member for the charity, I'd mightily appreciate it if someone at Amazon would take the time to nudge this invoice through the system.