The linked youtube video shows you the winch method.
http://www.youtube.com/watch?v=jGxY0tbUff4
You will notice the principle is to roll the tree rather than pull it down. The cuts used are also specific and assume a pre-existing felling cut.
If you have access to a felling lever or a Log Peavy you can rock the stem of the tree near to the base to encourage it to settle to the ground under gravity. You can improvise with a webbing strap and a long pole. You could try this with the tree still attached.
The following AFAG guide has been withdrawn but the advice it contains stands true.
http://www.fcauk.com/images/pdfs/AFAG302.pdf
Don't climb it. Don't surf it. Don't fell other stuff to try and knock it down. Don't try and rope it down.
You say it is still attached at the butt. There could be a decent amount of tension going on in the stem which could barbers chair on you when you cut it.
It is difficult to give accurate instructions on how to deal with what would effectively be termed a windblown tree in the eyes of NPTC AFAG etc without seeing it first hand. A hung-up tree as a result of felling is reasonably predictable. A hung up tree as a result of failure or windthrow is very unpredictable.
Either way, I would try and rock the thing down to the ground with a strap and pole if you don't have access to a felling lever or peavy.
Be safe,
Stu