Finally found the article this discussion was for. I noticed you didn't mention the links embedded in the paragraph you copied. One was to a list of studies--only one of which was done after 2004. The other was to an article Saletan wrote in 2006 which had this paragraph:

"The 30-year search for proof that gay parents are destructive looks a lot like the hunt for WMD. The American Psychological Association has compiled abstracts of 67 studies. Some are plainly biased, and only the latest two or three have avoided the methodological flaws of earlier investigations. But after 67 tries, you'd expect the harm of gay parenting to show up somewhere. Yet in study after study, on measure after measure, kids turn out the same."

Call it a draw. The data isn't conclusive on the pro-gay side (as he himself admits), but it's even less conclusive on the other side.