My friend Alex Herrera has long been interested in the Moller Gambit in the Giuoco Piano (1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.cxd4 Bb4+ 7.Nc3!?), and while it has long had a dodgy reputation, as the Brits are wont to say, Alex has kept his eyes open and found some new ideas.
One important very interesting and important idea of his is presented and discussed in Tim Harding's current
Chess Cafe column, entitled "The Giuoco Piano Revisited". You can find that
here, while Alex's contribution can be replayed
here. (I offer some comments therein, to the 18...Qc7(!) variation, prefaced with "DM". In particular, I think that after 18...Qc7 19.Bd3 d5 20.h3, Black should prefer 20...Kf8 rather than 20...g6, when as far as I can tell Black will consolidate with an extra pawn.)