Also note that there is information on tax-deductibility of donations outside of the U.S. on that site. If you are paying a lot of income tax you might be able to get some money back, donate even more or some combination of those two.
Even more easily, you can visit this interactive tool I made and it'll tell you which charities are tax-deductible or tax-efficient in your country, and give you the best links to them. It also has a dropdown covering 18 countries, including some in which tax-efficient routes are far from obvious.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.