One of the most frequent complaints I hear from paid content marketers is that it’s incredibly cumbersome to track digital edition and app sales data coming in from Amazon, Apple, Barnes & Noble, Zinio and other eReader devices. Basically, the data is not standardized and needs to manipulated by hand.But data-driven marketers (which you all are, of course) will be grateful to hear of CDS Global‘s new  platform called eEditions that aims to collect, filter, and standardize sales data from all of the major digital newsstands.According to Folio: “The Web-based platform essentially sits between the digital newsstands and the publisher and collects sales data, standardizes it and makes it available in a variety of dashboards that allow publishers to automatically generate reports.”The platform currently has Barnes & Noble, Amazon, and Zinio on board, and the company says it will be adding Apple data in the next few weeks.It’s surprising to me that these eReader companies are giving up data, given their historic reluctance, especially by Apple. But that may be because none of the data ties back to individual customers. Instead, the data provides an snapshot and overview of sales in a standardized format.This means that paid content sites may still be better off selling apps through their own site, as we saw in yesterday’s Case Study, as that allows them to collect individual customer data. But getting an idea of the cumulative effect of sales across different platforms will be beneficial to publishers as they seek to harness the convenience of tablets for subscription sales.