GuitarTube.org is a little site I built to help guitarists play along to backing tracks on YouTube. As I was building it, it occurred to me that it could be used for more than just backing tracks. For example, it's pretty handy when watching lessons too.
You can select from the thousands of backing tracks available on YouTube. When going from one song to the next, the fretboard below the video updates with safe notes to play. The goal is for you to have lots of jam time without ever having to interact with your computer, tablet, or phone.
The site will try to auto-detect the key and scales that would work best with the video currently playing. For the most part, it now does a reasonably good job at auto-detecting the right scale, but you could also set whatever scale and key you'd like too.
I built this site over a few days while on vacation, but I'm not done yet. I have several improvements to make that I will personally use. Beyond that, I'll be happy to work on it if it turns out to be helpful to others. So if you're getting something out of the site or have some feedback, please let me know. I love to hear from anyone who has found the site useful.