NOTE: I've combined all my various writings about tsunamis from December 2004 and January 2005, including this entry, into a single tsunami article, which might make a good introductory reference.
UPDATE: PayPal is now accepting direct donations for UNICEF at donations.paypal.com, while over on Kevin's site, more than 300 people have raised over $8000 USD, and the first $1000 has already been donated.
I've searched around for a way to donate some of the extra money in my PayPal account to tsunami disaster relief in Asia, but none of the major aid agencies, nor PayPal itself, has a way to do that. (Hint hint! Amazon's doing it! Get with it, guys.)
Fortunately, a writer named Kevin McDonald has set up a page on his personal website to let you do that. I don't know him, and can't vouch directly for the donations, but his site looks good, and will route the money through AmeriCares, which is a reputable relief charity.
If you have spare balance in PayPal, it's a convenient and essentially painless way to donate. I sent $20 USD—like me, I'm sure you can forgo some of those Boxing Week eBay purchases, right?