If you have any suggestions, feature requests, bug reports, or just want to let me know you got here, please feel free to reach out to me via email or Twitter. Your feedback keeps me going and provides motivation to keep working on the site.
Direct links to videos are easy. Just copy the URL from your browser's address bar and you're good to go. Every time GuitarTube switches to a new video, it updates the address bar to point to the video currently playing.
You can also get direct links to playlists, but it requires a few more steps. Start by getting the playlist's ID you want to watch by copying it from the URL you used to watch it on YouTube. You're looking for the text that comes right after 'list=' parameter (e.g., youtube.com/playlist?list=PLNz9D0QNkEwV5lOzJqopbTLMM07A1CNEu).
You'll next want to construct a GuitarTube.org link with the ID you grabbed above. For a playlist, use guitartube.org/?playlistid=PLNz9D0QNkEwV5lOzJqopbTLMM07A1CNEu.
First of all, you should let me know so I consider adding officially adding it to the site. Until it's added though, you can construct a custom link that makes it happen.
It's as simple as adding a 'tuning' parameter to the URL. Here's an example that shows a fretboard tuned standard: guitartube.org/?tuning= e-a-d-g-b-e. The key is the highlighted part which is the list of notes to tune to from lowest to highest with hyphen's separating each string's note.
If the tuning you're after has any sharps or flats, just follow the note with an 's' (for sharps) or 'f' (for flats). For example, this link would take you to a guitar tuned down ½ a step: guitartube.org/?tuning= ef-af-df-gf-bf-ef.
Take a look at the answer to the question about custom tunings above for the details, but you can use that to specify any number of strings. E.g., here's a link to an 8-string fretboard: guitartube.org/?tuning= gf-b-e-a-d-g-b-e.