U2 recorded Greg Lake's "I Believe In Father Christmas" for (RED)WIRE in studio in London.

Two sites you may consider in 2009 to make a difference:

(RED)WIRE
is a digital music magazine with one very important difference. It not only changes the way music is discovered, it provides medicine for people who need it in Africa. Unfortunately I can't join, because (RED)WIRE in not yet available in Germany.

Kiva.org
is the world's first person-to-person micro-lending website, empowering individuals to lend directly to unique entrepreneurs in the developing world. Micro-lending might not be the magic bullet in the struggle against poverty, but it certainly makes a big difference for many people.