My denomination, the Presbyterian Church in America has just published its statistics for the five year period from 2003 - 2007. You can see those figures, in chart form, by clicking on this link: Presbyterian Church in America Statistics
An analysis of those figures has been published by the Presbyterian Layman, a conservative voice in the PC-USA. That article can be accessed by clicking on this link: The Layman Online. Of note is this paragraph:
The PCA figures cover a five-year period, from 2003 through 2007. During that period, the denomination increased its communicant membership from 256,224 to 271,495, a gain of 5.9 percent. During the same period, PCUSA membership declined by 284,235, a loss of 11.4 percent and more than the total membership of the PCA.