Images, JavaScript, and Flash files that PHP sends to the browser are not affected by the GPL because they are data. However, Drupal's JavaScript, including the copy of jQuery that is included with Drupal, is itself under the GPL as well, so any Javascript that interacts with Drupal's JavaScript in the browser must also be under the GPL or a GPL compatible license.
"I thought it would be worth looking at some of the modules we use and why remember these modules are for our clients use primarily to make their life easier:..."
"This module makes it possible to import and export vocabularies and taxonomy terms via XML. Versions from 5.x on also support synonym terms. It requires the taxonomy module to be enabled."
"RSS Remote Enclosure allows a user to attach a remote resource link (say, to an MP3 on OurMedia.org) to any node (subject to administrator perogative)."
"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."
"This module loads panels through the PressFlow Preempt cache system. After installation, you can access a cached version of any panel by prefixing "preempt_panels/" to the regular panel path."
"Organic groups enables users with permissions to create and manage their own groups. Community members often want to self organize or spontaneously organize around a topic of interest."