On further study, we found that most of the free services were either defunct/broken or very restrictive and only the paid/commercial ones were going to be any good.
While exploring third-party solutions, we were also working on a roll-our-own hack which, eventually, came about quite nice recently.
At this point, I'm wondering if it would be worth while to launch a service of our own.
All comments, questions, ideas, suggestions etc. welcomed. :)