I want to write a module for Drupal 7 to integrate http://filepicker.io's awesome functionality. It's a simple JS widget that returns a URL of where the file is hosted.
I've never written a D7 module before, though I've written several for D6.
Should I create this as a fields widget (and if so, for which fields- file/image/link?), or should I create a whole new field type for this?
In production, my intent is to mix up the types a bit with this; that is, we have lots of images uploaded already, I'd just like to upgrade the 'upload' button (in lay terms) without breaking everything.