Earlier this month we wrote that although we are collecting data with respect to your mailings, you could not access these data yet. We are happy to announce that now you can access some of the data.
You can use the REST API logfiles method to see which log files we already have for your account. Moreover you can download the log files for the opens and clicks statistics in the easy to use CSV format. This allows you to analyze the impact of your mailings.
We are still working on this issue, and we expect to announce new and powerful methods and interfaces soon.