Transparent windows for note-taking

I just got an email from someone and they asked the following:

It'd be pretty cool if I could make my OneNote window at 50% opacity so I can see the program/window/webpage behind.

Sometimes you don't want to cut and paste something, but instead notate about it.

We have heard this request many times and I was thinking more about it and I found a couple of apps which help with this:

Pretty cool to see this in action, you just set the transparency and you can get this working right away.