We have one from 1961, using a different atmosphere (this one HCN, NH3 in a water solution). A key find here was the nucleotide base adenine, a base used in DNA and RNA.
In 2006, a new experiment shows how the earth may have been covered by an organic haze which can be created through a wide range of methane and carbon dioxide concentrations.
As to the early atmosphere. Here's what we think it may have been. There were probably less reducing molecules present than in Miller-Urey. Plus, volcanic eruptions would release carbon dioxide, nitrogen, hydrogen sulfide, and sulfur dioxide. What happens when you mix all this together? More diverse molecules than what Miller-Urey achieved.
In another blow against creationist misinformation, my own university (University of Colorado-Boulder) and the University of Waterloo performed simulations that suggest that the early atmosphere was up to 40% hydrogen (H2). This atmosphere is far, far more friendly to the creation of organic compounds and the building blocks of life.
I can has references plz? Thx.