Just stepped into the world of chord soloing. If you haven't done it, basically you take a tune, and every melody note is the top of a chord. So, you're switching positions almost every single note of the melody. It's GREAT practice, sounds pretty good done slowly, and obviously filters into all kinds of other skills: basic position switching, knowing chord inversions, knowing chords EVERYWHERE on the neck, arranging - cos the chord has to FIT the song harmonically. Fun, but you get your fingers into a crazy tangle. And I found a chord position, which in one position (2-4-3-3) I finger one way, and in another (8-10-9-9) I have to finger another.
It's very gymnastic, but done right sounds wonderful. I have the Lyle Ritz Jazz book, and that has Fly Me to the Moon as a chord solo in the back. I think there's another book which is JUST chord solos. Need to pick that up.
The other thing I would add, is that it's a very flexible technique, applicable to all kinds of situations. 10-finger rolls are a beast to master, but I think they evoke a very particular genre (though it would be fun to remove them from flamenco - hmmmmmmmmmm).
Anyhoo, my 2 cents.