The PDF version of the 1Q 2007 Long Island/Queens Market Overview [Miller Samuel]  that I write for Prudential Douglas Elliman [PDE]  is available for download. We just introduced this study series in 2006.
You can see the methodology that went into the report.
You can also build your own custom data tables  using the aggregate report data (from 2Q 2003 through 1Q 2007). I have created a series of quarterly market charts  that may be of interest as well.
…Overall price indicators showed weakness this quarter particularly at the higher end of the market. Overall median sales price showed relative stability as compared to the same period last year while average sales price showed a modest decline. Inventory levels are expected to level off as seasonal demand increases the number of sales. Current inventory levels remain below those seen in the second and third quarters of last year. However, the number of sales for the quarter is the lowest seen in three years suggesting a lower intensity of sales activity this spring, even when seasonally adjusted….
Download report: 1Q 2007 Long Island/Queens Market Overview [pdf] 
Here’s the media coverage for the study. I think I got most of them. Normally I would have covered this the day of publication last week but if you remember, I was kind of in Seine .
Here’s the recap: