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Danish Gambit, Soerensen Defense!
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Not a good reply against the Danish Gambit: Black gets no advantage after that! 
BirdBrain, black can easily equalize in this line, but it's better to play for a simple and clear advantage in the main line, shown below:
There are a lot of excellent ways to gain advantages as black against the Danish as it's unsound and only seen rarely in play above lower to middle club level, but this is one of the simplest and I'd recommend it, for what it's worth.
Pfren, I was going to ask you what your take was on the Danish.
I may post in my blog 2-3 annotated games (my annotations) on the 5...Bb4+ variation.
The reason is that I find Black's play so simple and convincing, that I don't get why people are still playing that double pawn sac crapola.
Pfren, would be interested in seeing this. The Danish is a bit annoying for me. Would like to put the nail in the coffin!
Sacrificing, I think black has no advantage in the position you gave. I have experience about it with white from about 3-4 more serious games. True, black's 3 vs. 1 is in theory better than white's 4 vs. 2, but white's pawns might get tempi from the black knight and king, and it won't be easy for black to advance with his pawns before a rookless endgame - and white won't let him exchange down to such an endgame. The position is in balance, but double-edged, and it is perfectly playable for both sides.
The reason why I have practically given the Danish up is in fact 3...d5. It is very hard to find any reason for an advantage or a way to avoid a simple, drawn ending after 4.cxd4 Nc6 5.Nf3 Bg4 6.Be2 Bb4+ 7.Nc3 Bxf3! 8.Bxf3 Qc4!, and now either 9.Qb3 or 9.Bxc6+.
I admit that IM pfren's 3...dxc3 4.Bc4 cxb2 5.Bxb2 Bb4+ is probably objectively better than this, though. I have usually played 6.Kf1 to this, but with precise play from black, I think that white will not have enough compensation. Still, white has practical chances and black does have to know some lines to avoid losing in the opening. The line is not playable at the level of titled players, except maybe as a surprise weapon in an OTB game. Against club players or so, though, it is a formidable opening, and when I was in my 1600s to 1800s I used to get excellent results with the Danish.
I have NEVER played the Soerensen Defense before against the Danish Gambit! I always normally take the offered pawns, but the fight afterwards can be a bit annoying. This approach seems more my style:
According to Chess.com, there are 212 games in the database. The stats are 31-33-36, which is DEFINITELY in Black's favor! Not only does this defense equalize immediately - it offers Black excellent chances for a win!
Today was my first time trying the defense. I have read good things about it, but never tried it before, so without any theory to work with, I winged a game - and it turned out great! My opponent was roughly the same strength as me, so I believe he was not expecting this response. I won in 12 moves with Black!