World Toilet Day
There is, apparently, a global sanitation crisis, and donations to this site will help stamp out diseases in vulnerable areas.
That is one excellent idea and Twitterlit is another. If you go here you can add a TwitterLit gadget to your blog too and twice every day you will see a new first line from a book linked to Amazon.
(I have to tell you, dear blog-reader, that I resisted so many double-entendres in this post I feel almost heroic.)