It's great to have something like this, but I have never heard of this site.
How do we know that the donated coins are actually used for charities?
I'll do some more research and if I'm sure this is legit I will make a donation.
If you actually visit the site -
www.bitcoingivingtuesday.org - you will see each charity has their own donation page and wallet set up.
There are two exceptions where the charity does not accept Bitcoin directly:
1. Bitcoin Foundation is raising funds for Hal Finney tribute for an ALS organization.
2. BitGive is sponsoring a campaign for Medic Mobile.
Thanks!