Here is a snippet from my post at Internet Cafe Today:
About 12 years ago, I experienced my first bout of extended depression, not just a week or two of the blues, but the real deal--a suffocating, absolutely relentless depression. It made me feel like one of those caged cats in the zoo who paces back and forth day after day after day behind steel bars, unhappily separated from his former life and former self--or perhaps who spends the day sleeping, seizing his only respite from his misery ... I'd like to offer a few tools, simple as they are, that I use to help batten down the hatches when the winds of depression kick up in my life. Maybe they will be relevant to you or a friend.
The first/best line of defense against any threat is prayer and reading God's Word, of course. But since we eventually have to close the Bible or stop praying actual words for periods of time, I think it's wise to have some small practical weapons in our arsenal with which to fight these battles. Sometimes it only takes a few stones in a slingshot to bring down an enemy of the Lord!