During the Heroic Professor Putricide fight in Icecrown Citadel, if you receive Unbound Plague, you will begin a 10 second countdown in /yell. The countdown looks like this:

Help me in 10 seconds!
Help me in 9 seconds!
...
Help me NOW!

Plagued is about 100 lines of code. It uses 8K of memory and zero CPU until you have actually pulled Putricide.

Example video: http://www.youtube.com/watch?v=7YRxQx6Rsls
The UI used in the video is available for download here.

AddonLoader recommended

Installing AddonLoader will cause this add-on to only load when you enter the appropriate raid zone or sub-zone.

Comments and bug reports

General comments and questions can be posted at the WowAce site. Bug reports and feature requests should be made using the ticket system.