Here's an article about recording vocals, talking about things like how close you should get to the mic. It also talks about proximity efffect and how it can be a problem as well as a blessing. Personally when recording for voice over jobs, I like to use proximity effect (which basically says that you get a deeper, "bass-ier" sound the closer you get to certain (most) microphones) to make my audio sound a bit more intimate and immediate. But like anything else, too much of a good thing.....and all that.
Here is that article: