Bit of a cheat today, as this is something I already do. Maggie Mason suggests:
Do some research and point your readers to a few worthy charities. While you're at it, explain what their donations would accomplish for the organizations you list. Then put your feet up and bask in the warm glow of self-satisfaction.
I do this every month, and already did it for December, so I'm not going to reiterate. Click on the "Giving" link on the sidebar (under categories) to see all of the past charities I've highlighted. I will give this reminder, though: if you give before January 1, you write it off on your 2007 taxes.