I currently use the Favourites feature of GT for two things:

- I add lessons that I have particularly enjoyed and would like to revisit

- I add lessons that I am struggling to perfect and need to come back to

I think it would be useful to be able to add custom groupings within 'Favourites' so that you could add favourite songs, techniques etc but also add things that you need to come back to. This would be particularly useful for users who are "stuck" on a lick or something, want to move on, but don't want to forget to keep going back to work through all their problem lessons in one place.

Other ideas would be the option to group favourites by style of music etc.

Just a thought...