Alright, it's ready. It is simple, but it is useful.
If you make websites and you have URLs, domains, etc, and you want to show a logo that relates to that, the Brandmarks basic Image API can discover, cache and show a corresponding organization's logo for a given domain.
Please, give it a try and let me know how it works for you. Critical feedback welcome.
And if you end up using it in something useful, don't forget to tell me here and also on Twitter so we can mutually benefit from the awesomeness.