Huh, can't believe I hadn't seen this before. I suppose the main problem with all of these systems is that the creator ultimately has to sign up to them in first place, and unfortunately all these smaller sites just don't have the people I want to donate to on them. There's no quick and easy answer to that unfortunately, outside of trying to federate some kind of standard for all donations that clients could plug into, and we all know how that goes[0]

[0]http://imgs.xkcd.com/comics/standards.png