I just finished reading Enjoy Your Prayer Life by Michael Reeves on Sunday.
I found this short little book to be powerfully convicting, but not in a way that beat me over the head or loaded on the guilt. There was definitely the sense that one's prayer life speaks volumes about their personal spiritual life, which cuts like a knife when your prayer life isn't so hot... But instead of loading on the guilt with extended stories of those prayer warriors of our faith, Michael Reeves would temper those stories with those prayer warrior's prayer foibles.
The end of this book was full of hope, found in the practical applications that the author offers. Applications that give the reader real ways to point their hearts toward joy in prayer.
I highly recommend this book.