I am not a developer - and I searched and could not find this (though I'm a basically lazy n00b who may have missed this)...
Has anyone worked on anything like an Ergonomic Reminder system? We use Openfire/Spark as our corporate IM, and we had a recommendation that we start having periodic little reminders to stretch, or rest your eyes, etc... I was thinking about this and it seems like perhaps a Spark plugin for this would be pretty good. It wouldn't require another application - and Spark is pretty non-invasive with it's reminders, so it won't impede someone while they are working - just flashing like any other IM.
If you know of a plugin like this, please direct me to it. If you are a developer who is interested in it and would like more info, please respond.
Now go start some fires. 
Thank You.