Already did ($100). I hope this is a legitimate charity...
Another donation I'd like to make is pig fat to be used to coat the Russian munitions that'll hopefully be raining down chechnya
I managed to track down what appears to be the parent organization at the IRS website.
http://www.irs.gov/charities/page/0,,id=15053,00.html
Fund for Victims and Hostages of Moscow Terror
Bensalem PA
Until October 2006
The charity was set up after the Moscow theater attack.
I used may PayPal account to make my donation. They are a PayPal verified member. So far as I can tell it is a legit organization, but I am nowhere near being an expert at this sort of thing.
If you visit the "Wayback Machine" you can see that the MoscowHelp.org website has been around since November 23, 2002.
http://web.archive.org/web/*/http://www.moscowhelp.org/