I just read a post on communication that related to content versus visuals in their relative importance. The conclusion was that neither trumped the other, but in fact connection trumped them both. In the more specific realm of biblical preaching, we have to give precedence to the content, but that does not mean we neglect all other aspects of effective communication.
A point made concerned the preparation of a presentation. It is not good to start by sitting at the computer to plan the visuals. It is much better to spend time in thought with pen and paper to determine the desired outcome and the best way to achieve it. How true that is. It is true for a business presentation, and it is true, with modification, for preaching as well.
How easy it is to slip into starting with illustrations, visuals, message details. It is also easy to start with thinking about what we want to achieve and then go hunting for a text to utilize in that quest. But really we should be starting away from the PC, Bible in hand and congregation in our prayers. Good preaching preparation does logically follow the eight stages I advocate on this site, but this is not a formula. Good preaching starts with a real soak in the text, out of which can spring the budding thoughts on how to preach that text, outline, illustrations, etc.
It is that initial soaking in the text (study, analysis of structure, content and intent, coalescing of the main idea, etc.) which is the critical first half of the bridge we are hoping to build to our listeners. Too many preachers build backwards only to discover the bridge is weak on the Bible side and consequently, weak in authority, power, etc.