Hello, 
    I played a game in Lemberger line using 4.Nge2 variation, so-called Rasmussen attack. I consider it the most decent and sensitive try against 3...e5. 

[Event "Rose and cross"]
[Site "www.sachy.sk"]
[Date "2003.08.13"]
[Round "1"]
[White "sevenviolets (2130)"]
[Black "schwartz (2190)"]
[Result "1-0"]

1. d4 d5 2. e4 dxe4 3. Nc3 e5 Lemberger countergambit, among others also recommended by Scandinavian (1.e4 d5) specialist IM Sikora-Lerch   
4. Nge2! perhaps the only posibility for white to play for advantage Nc6!? strong reply, also recommended by GM Eric Prie at www.chesspublishing.com ;
5. d5 Nce7 6. Ng3 f5 Eric considers 6..Nf6!? stronger, I´m not sure about it 7. Bc4 a6 8. O-O Ng6 9. Nh5!? b5 10. Bb3 b4 11. Na4 f4 12. Qe2! Qh4 13. Qc4 Kd8 14. d6 and white has very strong attack Ra7 15. Ng3 cxd6 16. Nxe4 Nf6 17. Qxb4 Rc7 18. Rd1 Nxe4 19. Qxe4 Bb7 20. Bd5 Qg4 21. f3 Bxd5 22. Rxd5 Qd7 23. b3 Rc6 24. Ba3 Be7 25. c4 Rf8 26. c5 Ke8 27. Nb6 Qc7 28. Nc4 dxc5 29. Nxe5 Nxe5 30. Rxe5 Rf7 31. Rc1 Kd8 32. Bb4 Rff6 33. Bc3 Qd7 34. Ba5+ Ke8 35. Re1 Qd4+ 36. Qxd4 cxd4 37. Rxe7+ Kf8 38. Bb4 h6 39. Rd7+ Kg8 40. Rxd4 Kh7 41. Be7 Rf7 42. Rc4 Rb6 43. Rce4 Kg6 44. Bd8 Rb8 45. Re6+ Kh7 46. Re7 Rxe7 47. Bxe7 Re8 48. Kf1 Kg8 49. a4 Kf7 50. Bb4 Rb8 51. Re4 g5 52. Ke2 a5 53. Bxa5 Rxb3 54. Bd2 Rb6 55. a5 Ra6 56. Re5 Kf6 57. Rb5 Ke7 58. Rb6 Rxb6 59. axb6 Kd7 60. Bc3 Kc6 61. Bd4 1-0

Sincerely yours
Sevenviolets