AlwaysCurious
Contributor
Maybe you are looking for microformats that are a simple standard to embed calendar data (or pim data in general) in a machine readable format into your site. (See http://microformats.org/wiki/hcalendar) There are several Javascript solutions to read and Firefox extensions to even automatically extract this information and export it into calendar applications. Example I recently stumbled upon: https://addons.mozilla.org/en-US/firefox/addon/4106 and a little explanation how to use it: http://labs.mozilla.com/2006/12/introducing-operator/