Justin Darlington is an amazing two footed leaper, and based on the videos I saw on youtube, has just begun training for high jump. He doesn’t look nearly as good off one foot, but he has a running vertical off two feet of about 48".
Here are a couple vids:
http://www.youtube.com/watch?v=Z8tw0Gyfae4
http://www.youtube.com/watch?v=6U85nq_2CgQ
http://www.youtube.com/watch?v=60LQJGFO7zs
http://www.youtube.com/watch?v=3lNvB-9psEo
I wonder if we have another Donald Thomas in the making.