Our organization (Firefighter Ministries) has been writing a devotional series called Beyond the Lights & Sirens. We currently have four up in the Life Saver Series. They can be used for either self study or for small group discussions. You can find them here: http://www.firefighterministries.org/Sirens.htm We just added a new one on strength yesterday.
Let me know what you think. And let me know if there are any particular topics you would like to see used in upcoming editions!