Woo hoo! this is some really neat stuff. The dudes at TheGoodBlogs have developed a way to translate midi files into Ocarina Notation. I have to say the concept is really cool, especially for people who are new to writing music in Ocarina notation or otherwise.
Here's the link to the converter.
I tried it a few times on different songs and had some great success with these midi files
These two examples are slightly different and the first one has full chord progressions, but the generator was able to separate out the melody. Now you too can play "Away in a Manger". This is a really cool thing considering there are a TON of midi files available.
Here is a massive database of songs to get you going. http://www.8notes.com/