I have another AddOn for you to check out. The RE:Group AddOn for Blender 2.68.
REMEMBER: You must enable Auto Execution of python scripts for this AddOn to work.
RE:Group manages a link between a group and a particle system. Part of the management tasks are to calculate the offset animation from the source group into the cluster Empty that deploys the final animated object. This allows group based animations to be delayed until a particle is born. Also the timing of the original animation may be time stretched to produce faster or slower copies from the original. All deployed by the standard particle system.
A short introduction tutorial that explains how to use RE:Group.