I love the crowdsourcing going on here.
I use a very minimal X environment (I only have libs installed that are necessary for Firefox, gimp, and what's needed for scrotwm) & even though this is KDE/Qt, watching it come to life rocks.
It's Qt, but has no dependencies on KDE

But indeed, looks like this project is going in the right direction.
Edit: The recipients should probably be put in some kind of vertically scrollable area. Right now the window resizes when adding more and more recipients, until it is bigger than the screen

Done! And the "updating" icon is animated now.