I generally hear confessions most days, as it is scheduled 3x a day each weekday at the Cathedral. Usually, there is a pretty steady line of penitents and there isn't much dead time. However, I bring something with me to read more often than not, b/c if you don't bring anything, no one shows up for the sacrament.
Most of the time, I bring something spiritual to read: Letters to my Brother Priests, by JPII; the recent edition of First Things, the breviary. However, the other day (I won't say which) my Autoweek came in just before I hit the box, and I had to take it with me. It was the Racing Year in Review, and I wanted to catch up on the series I follow (NOT NA$CAR!). I know, not the most spiritual of reading, but you gotta have down time as well.