Q: how do I download a 37 minute video recorded on my iphone to my computer or Youtube?

You can use Image Capture (comes with your system) to download the video to your computer.

Once it's there, you can upload the file to YouTube, Vimeo or bunch of other sites to share the video.

x

It's on your mac

ITunes for windows I think puts photos/movies in your windows folders.  It's been a while since I've used iTunes for windows.

I just looked, you can share movies to youtube straight from the iphone.  just look at your camera roll and select the video, hit the share button