In the modern age of computer technology, handheld PDAs, blackberries and iPhone's, we can become too reliant upon technology. Don't get me wrong, technology can be a very good thing and can be very helpful but he cannot take the place of good study habits and brainpower.
I use a computerized Bible program called Quick Verse to help me search the Scriptures. It's a real timesaver. There are electronic versions of commentaries and other Bible reference works that are very helpful. Mainly because you can search with your computer for any particular word or phrase. But I must warn you, these electronic study helps do not help you with the creative aspects of sermon preparation. The best thing you can do to speed up your sermon preparation is to fill your mind with the word of God. Nothing can take the place of the computer that God has given you inside your skull. Our problem is not that our brains are not strong enough or powerful enough but that you fill them with garbage and then expect them to produce beautiful, profound sermons.
Let me suggest the Bible study program to you that will fill your mind with God's word in a way to make it available to you during your sermon preparation process. This simple program has two parts. First, read the Bible every day. That's simple. May I suggest to you that you set aside every morning at least 30 minutes per just Bible reading. During this 30 minutes you should be able to read 3 to 5 chapters of the Bible. It doesn't matter in what order you read them just that you read them. And when I say we them I don't mean just move your eyes open the words, but try to understand what's being said. If you eat 3 to 5 chapters of the Bible every day you will read through the entire Bible in less than one year. By doing this you are familiarizing yourself with what the Bible says. You are becoming intimately acquainted with God's word. So that, when you're preparing your sermons your computer brain will have access to this data that you absorbed during your daily Bible reading. Make this a daily habit year in and year out and your brain will be overflowing with sermons and biblical illustrations each time you set down to write a sermon.
The second part of this program of Bible study is to spend several hours each week studying a particular chapter of the Bible and keeping a notebook on what you studied. When I first went into the ministry I tried to study at least one hour per day on one chapter of the Bible. What this meant was that I read the chapter again and again and then answer some pertinent questions. I would ask myself: What is the subject of this chapter? Who is this chapter about? Where do the events take place? Why is the writer speaking on this subject to these people? What is God saying to me in this chapter? Then after answering these questions I would write down three or four sermon ideas that I would have about this chapter. As you do this week in and week out you will be developing your own homiletic commentary that will be useful to you in years to come. In addition, once again, you're filling your mental computer with biblical data that will be available to you sit down to write your sermon.
Remember, the root of the word disciple is the word discipline. You must discipline yourself to study God's Word. This is the most important discipline that you can develop as a preacher so as to help you with your sermon preparation.