From Vatican Information Service:
Benedict XVI will grant Plenary Indulgence to the faithful participating in the 21st World Day of the Sick to be celebrated 7–11 February, in Altotting, Germany according to a decree published today and signed by Cardinal Manuel Monteiro de Castro and Bishop Krzysztof Nykiel, respectively penitentiary major and regent of the Apostolic Penitentiary.
Persons following the example of the Good Samaritan, who "with a spirit of faith and a merciful soul, put themselves at the service of their brothers and sisters who are suffering or who, if sick, endure the pains and hardships of life … bearing witness to the faith through the path of the Gospel of suffering" will obtain the Plenary Indulgence, once a day and under the usual conditions (sacramental Confession, Eucharistic communion and prayer in keeping with the intentions of the Holy Father), applicable also to the souls of deceased faithful....Read the news release here.
Read the decree on Zenit here.
Read Pope Benedict's Message for the 21st World Day of the Sick here.
The Catholic Chaplains web site has more information about the World Day of the Sick here.
Here's a video by the Catholic Health Association of the U.S.: