There is no pressure to do so, but if you are able to donate any amount, go to Shelter Box USA. They are a non-profit whose purpose is, "To provide humanitarian relief and aid in the form of equipment and materials that provide shelter, warmth and comfort to people displaced by natural or other disasters."
You can find more information about Bloggers' Day of Silence at Utterly Engaged and For Japan With Love. Thank you for anything you may do to try and help the people affected by the recent natural disaster. No matter how big or small, or the nature of your gift, it all matters and will be remembered.