I realize you asked for examples, not tools, and this may be overkill for what you're wanting, but http://ushahidi.com/products/ushahidi-platform.
Ushahidi would be good if you wanted a geographic, time-series visualization mashed-up with social media.
I imagine that could be a worthwhile project on a large scale for many libraries.
A Google Fusion Table would be a simpler mapping/charting alternative. e.g. https://www.google.com/fusiontables/DataSource?docid=1JRSvdVxym2lKiM2cnfB7vmY735l58GSxD5O7-g0
Digital Projects Librarian
A.R. Dykes Library
University of Kansas Medical Center
From: Code for Libraries [[log in to unmask]] on behalf of Francis Kayiwa [[log in to unmask]]
Sent: Wednesday, June 05, 2013 3:38 PM
To: [log in to unmask]
Subject: Re: [CODE4LIB] Visualizing (public) library statistics
On Wed, Jun 05, 2013 at 03:40:29PM -0400, Cab Vinton wrote:
> Come budget time, I invariably find myself working with the most
> recent compilation of public library statistics put out by our State
> Library -- comparing our library to peer institutions along a variety
> of measures (support per capita, circulation per capita, staffing
> levels, etc.) so I can make the best possible case for increasing/
> maintaining our funding.
> The raw data is in a Excel spreadsheet --
> http://www.nh.gov/nhsl/lds/public_library_stats.html -- so this seems
> ripe for mashing up, data visualization, online charting, etc.
> Does anyone know of any examples where these types of library stats
> have been made available online in a way that meets my goals of being
> user-friendly, visually informative/ clear, and just plain cool?
> If not, examples from the non-library world and/ or pointers to
> dashboards of note would be equally welcome, particularly if there's
> an indication of how things work on the back end.
YMMV but I've used infogr.am 
Granted the type of data I was using doesn't compare to the kind you are
trying to tame above.
Failing that there's lots of listed at datavisualization.ch that could
help solve you problem. Here some assembly will be required.
> Cab Vinton, Director
> Sanbornton Public Library
> Sanbornton, NH
i'm living so far beyond my income that we may almost be said to be
-- e. e. cummings