I wrote my own CMS (very, very light) for this one.
My client was Rechtspreventie.nl, who managed to sell this idea as an extra service to one of the largest insurance companies in the Netherlands. The website can be found here. has been removed.
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IMPORTANT:
As of version 1.0.1, this widget has been removed from the Ajax Event Calendar plugin. Instead, use the [eventlist] shortcode explained here:
http://wordpress.org/extend/plugins/ajax-event-calendar/installation
The shortcode offers more customization and placement options than the old widget, explained here:
http://code.google.com/p/wp-aec/wiki/ShortcodeOptions