I recently had a small part in a free eBook about using R in Power BI:
The eBook is available for download from BlueGranite’s website. It covers the use of R scripts, R visuals, and “R powered” custom visuals.
Please download a copy and spread the word!
Support for this initial eBook could lead to potential future content surrounding more detailed use of R in Power BI. Please show support for these potential endeavors by downloading the eBook and leaving comments.
Update 6/6: Many thanks to David Smith at Microsoft for his post about this eBook on the Revolutions blog.