For me I'm actually more likely to have Baen stuff in
both p and e format than only one or the other, but that's starting to change: now that I have something I'm trully comfortable with reading them on, I'm trying to buy e-versions directly, and not buy paper versions at all (I don't have any more shelf space!). I was a bit reluctant to buy
only the e-version before I got my Sony Reader.
That being said, I admit that most of what I had electronically from them (Pre-Sony Reader) was from the CDs that came with some of the hardbacks I bought, and yeah, they
did start me reading (and buying) other Baen authors. For instance I first read John Ringo in a free e-version of
March Upcountry, I'd've most likely eventually tried him anyway, given that he was writing with David Weber on that one, but it sure sped the process up for me.