From the Catholic Society at Imperial College:

Cardinal Joseph Ratzinger, former Prefect of the Congregation for the Doctrine of the Faith, and Dean of the College of Cardinals, has been elected as our new Pope. Let us pray that he may guide us faithfully.

The prayer for the new Pope as distributed by the Vatican is as follows:

God our Father, shepherd and guide,
look with love on Pope Benedict XVI, your servant,
the pastor of the Church.

May his word and example
inspire and guide the Church,
and may he, and all those entrusted to his care,
come to the joy of everlasting life.

Grant this through our Lord Jesus Christ, your Son,
who lives and reigns with you and the Holy Spirit,
one God for ever and ever.

Amen