So there are some things I don't know how to do, and making AMVs is one of them.
However, I have friends that do know how to do these things, and one of them just recently created a new AMV mixing together Kingdom Hearts and Air.
Just to make it abundantly clear, this is a work that a friend of mine put together, and not something that I claim any ownership in. All I'm doing is spreading the word.
There's more information at my friend's blog, or on YouTube itself for this video. Or you could just watch the embedded version below. I definitely think it's worth watching, however you go about doing that.