This has actually been going on for a while. Once a year over at the Allspark forums, they run a donation drive for the Hasbro Children's Hospital. The pony community over there is pretty huge, and we did actually raid it last year pretty hard, so maybe we can do it again!
Hit this post up for information on it. They also have a forum signature generator you can use to help spread the word.
Check out the actual charity page here!