Availability module is an abstract solution to associate a set of dates with certain nodes and users assuming that these nodes are available on specified dates for a certain user.
This module loads panels through the Preempt cache system. After installation, you can access a cached version of any panel by prefixing "preempt_panels/" to the regular panel path.
Pressflow Preempt is a caching module with several benefits over the Drupal core cache, although it is not an appropriate replacement in every case. A simple use of this module's capabilities is Pressflow Preempt Panels.