Usually most of my reading is contemporary stuff, either the latest Christian authors such as John Ortberg, Mark Driscoll, Rick Warren and Bill Hybels, or contemporary fiction such as John Grisham, Ian Rankin or Susan Hill.
However, I've decided in 2011 to follow a pattern set by Rick Warren, who says that "25% of my reading is from the 1st 1500 yrs of the church, 25% from last 500 years, 25% from last 100 years, 25% current".
I'm going to try and follow that for both my Christian and my fiction reading. At the moment I'm reading "Lectures to My Students" by Charles Spurgeon and "Crime and Punishment" by Fyodor Dostoyevsky, and am really enjoying both. I might even write some book reviews to try and encourage others to read some "old school" stuff too! I've got some Augustine and some Martin Luther lined up next.
Incidentally all of this is helped by having the Kindle, as lots of the older books are either free or cost under £1 (also a great way to 'justify' buying a Kindle to both yourself and others!).