Here's a quick overview of papers in the last year and a half that have produced amino acids through experiments not operating in the CH4/NH3 atmosphere. I've excluded anything older than 2005.
Ehrenfreund P, Rasmussen S, Cleaves J, et al.
Experimentally tracing the key steps in the origin of life: The aromatic world
ASTROBIOLOGY 6 (3): 490-520 JUN 2006
Plankensteiner K, Reiner H, Rode BA
Amino acids on the rampant primordial Earth: Electric discharges and the hot salty ocean
MOLECULAR DIVERSITY 10 (1): 3-7 FEB 2006
Orgel LE
Geothermal synthesis and metabolism
ASTROBIOLOGY 6 (2): 297-298 APR 2006
Hazen RM
Genesis: Rocks, minerals, and the geochemical origin of life
ELEMENTS 1 (3): 135-137 JUN 2005
Saladino R, Crestini C, Costanzo G, et al.
On the prebiotic synthesis of nucleobases, nucleotides, oligonucleoticles, Pre-RNA and Pre-DNA molecules
TOPICS IN CURRENT CHEMISTRY 259: 29-68 2005
Pascal R, Boiteau L, Commeyras A
From the prebiotic synthesis of alpha-amino acids towards a primitive translation apparatus for the synthesis of peptides
TOPICS IN CURRENT CHEMISTRY 259: 69-122 2005
Shapiro R
Small molecule interactions were central to the origin of life
QUARTERLY REVIEW OF BIOLOGY 81 (2): 105-125 JUN 2006
Bouchoux G, Guillemin JC, Lemahieu N, et al.
Protonation thermochemistry of aminoacetonitrile
RAPID COMMUNICATIONS IN MASS SPECTROMETRY 20 (8): 1187-1191 2006
Morita M, Harada Y, Iseki K, et al.
Mass spectroscopic approach to amino acids formation processes by UV irradiation to simple organic molecules in aqueous solution
ANALYTICAL SCIENCES 21 (9): 1085-1090 SEP 2005
Saladino R, Crestini C, Neri V, et al.
Synthesis and degradation of nucleic acid components by formamide and cosmic dust analogues
CHEMBIOCHEM 6 (8): 1368-1374 AUG 2005
Nakazawa H, Sekine T, Kakegawa T, et al.
High yield shock synthesis of ammonia from iron, water and nitrogen available on the early Earth
EARTH AND PLANETARY SCIENCE LETTERS 235 (1-2): 356-360 JUN 30 2005
Plankensteiner K, Reiner H, Rode BM
Prebiotic chemistry: The amino acid and peptide world
CURRENT ORGANIC CHEMISTRY 9 (12): 1107-1114 AUG 2005
Chen QW, Chen CL
The role of inorganic compounds in the prebiotic synthesis of organic molecules
CURRENT ORGANIC CHEMISTRY 9 (10): 989-998 JUL 2005
Chyba CF
Atmospheric science - Rethinking Earth's early atmosphere
SCIENCE 308 (5724): 962-963 MAY 13 2005
Tian F, Toon OB, Pavlov AA, et al.
A hydrogen-rich early Earth atmosphere
SCIENCE 308 (5724): 1014-1017 MAY 13 2005
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