Thanks for reminding us of the important role Eric Flint and his publisher the late Jim Baen have had in promoting ebooks, particularly multi-format, DRM-free editions. Flint began writing his Prime Palaver columns for Baen on this topic in December 2000. I read all of them avidly when originally published.
All of his columns have been collected as an ebook, available in the Baen Free Library:
http://www.baenebooks.com/p-1861-prime-palaver.aspx
They're still relevant and very much worth reading by anyone interested in DRM and in ebooks in general.
I'm grateful to both Flint and Baen for their important role in bringing ebooks into my life.