I'm glad he's talking about the Priest's books...I have both the Magnificat app and the iMissal app on my iPhone, so I use that for Mass :)
In a recent blog post, Father Antonio Spadaro, known as the Vatican’s “cyber theologian,” said that devices such as iPads, smart phones and tablets should not be used instead of missalettes at Mass.
It is “unimaginable that an iPad or a laptop would be carried in procession, or that a monitor would be incensed and kissed during the liturgy,” Fr. Spadaro said.
The liturgy, he explained, is “the bastion of resistance” against the separation of the written word from the ink on the page. “The page remains the 'body' of a text,” he underscored.
A member of the Pontifical Council for Communications, Fr. Spadaro wrote in his blog about the decision of the Bishops’ Conference of New Zealand to deny the request by several priests for permission to allow mobile devices to be used at Mass.