Instapaper is a project mainly written in PHP, it's free.
Instapaper Drupal module
Author: Mark Dorison E-mail: [email protected] Twitter: @markdorison
Requires: Drupal 6.x, service_links module
This module allows you to add an Instapaper 'Read Later' link to your nodes. To read more about the Instapaper service please visit http://www.instapaper.com/.
This module has no affiliation with Instapaper or its creator, Marco Arment, but we certainly appreciate his hard work!