Anyone play the Latvian?
I have seen 3.Bc4 quoted as a refutation of the Latvian gambit, but it should not be taken as such. 3...fxe4 4.Nxe5 d5 is good for black.
One line that should give white a nice game is
3.Nxe5 Qf6 4.d4 d6 5.Nc4 fxe4.
White now has a number of good moves. 6.Be2, for example, prevents the Queen from coming to g6 and maintains the flexibility of the b1 knight.