The Cardinal Deacons are Angelo Comastri, President of the Fabric of Saint Peter, and Giovanni Lajolo, President of the Governorate of Vatican City State.
The Pope is wearing yesterday's mitre and a new chasuble belonging to the set of yesterday's cope. Here are two shots allowing us a closer look at the nice damask of the vestments:
The pallia are brought to the Pope:
The Pontiff imposes the pallium on Archbishop Carlson of Saint Louis:
And on Archbishop Ghaleb Moussa Abdalla Bader of Algiers:
Archbishop Vigneron of Detroit having received the pallium:
The Holy Father with some of the metropolitans having received the pallium:
Incidentally, I've come across a rather interesting detail on the occasion of yesterday's papal Vespers. A user of the Pope Benedict Forum noticed that the mosaic depicting Pope Benedict XVI in the line of papal portraits in the Basilica of St. Paul Outside the Walls has been changed. Originally, it showed the Holy Father wearing the form of pallium introduced by Msgr. Piero Marini in 2005 (cf. NLM article here):
Now, the roundel portrays him wearing the form of pallium introduced by Msgr. Guido Marini on this day last year (cf. NLM article here and here, as well as images from last year's Mass here):
(Images from St. Paul Outside the Walls by Pope Benedict Forum user "Benodette".)