I am really skeptical (though I'd be more than happy to see someone prove me wrong) about these "framework" apps, that doesn't actualy do anything by itself, except to provide an API of some sort for others to take advantage of. They reminds me of those obscure ActiveX plugins (3D model viewers, etc) that sites make you install. I am usually somewhat hesitant about getting them on my computer unless a see great value (eg growl), but I suppose I'll be even less willing to have these on my iPhone, as an app that sits somewhere on my home screen. My users might feel differently about this, but it certainly would be very difficult for me to explain to them what is it that they are installing and the experience could become quite confusing.