I'm curious if this concept is limited to first having a full homescreen overhaul, or if it can be accomplished in a widget?
Is there a flick-scrolling contacts widget? - Android Forums
From the thread, it appears that it's a limitation and that a homescreen replacement app must be used to jump off of.
For the serious developers, is location based scrolling available for widgets? by location, i mean within the widget, not geographically speaking.