I'm struggling to feel enthusiastic about this one, it seems to be designed more to just do something with Bitcoin, rather than provide any actual innovation.
I hope that this app or another one can do to Bitcoin what Transmit did to FTP (http://panic.com/transmit/) or the Github native app did to Git (http://mac.github.com/).
The Github app is actually not my favorite Git GUI, Gitbox is (http://gitboxapp.com/).
But now I use it on the command line all the time.
Plus it's much easier (for me) to shift-click a few files than git add path_to/file_changed N times.