Zapier has become one of my favorites web services. I've always lamented that IFTTT doesn't cater to the productivity/project management crowd by offering a very limited set of channels to work with. Then Zapier came along and blew me away.
One of my favorite bits of Zapier happens when you want to wire up services they don't support: they actually ask you for an email address to notify you when they do support it. And yet almost nobody else does.
More impressive (although this is, to be fair, a low bar): they do not try to stick you on a mailing list or anything like that.
