It's important to stay 8" to 10" from the microphone (depending on what you're recording of course). When your recording something that gets loud it's important to back off a bit or turn a little to the side.
Aside from that common sense, there is a great opportunity to have greater "saturation" when you're saying something that is more thoughtful by moving in much closer and speaking more softly.
This gives an intimacy to the sound of a persons voice and is a very persuasive sound. Learning to "Work the Mic" can bring a much richer harmonic landscape to your recordings that is much more personal that just reading well at a good recording level.
