Recommended reading on the topic of 
heaven:

Rumors of Another World, by Philip Yancey
90 minutes in Heaven, by John Piper
Heaven, by Randy Alcorn
Heaven: My Father's House, by Anne Graham Lotz 

Recommended general reading:

Jim and Casper Go to Church, by Jim Henderson and Matt Casper
The Sacred Romance, by John Eldredge and Brent Curtis
The Mind of Christ, by T. W. Hunt
The Divine Conspiracy, by Dallas Willard
The Blessing, by John Trent and Gary Smalley
The Case for Christ, by Lee Strobel
Your God is Too Safe, by Mark Buchanan
If You Want To Get Out of the Boat ..., by John Ortberg