And, since the Dear Author site is aimed at the reader of romance novels, I would think that they would want to put some pressure on Harlequin books (
www.eharlequin.com) to add the Sony format to their site. "The eBook Store links to three free readers: Adobe, Microsoft and Mobipocket. We sell eBooks in each of these three formats." So, the only format from one of the most prolific publishers of romance books that can be read on the Sony reader is PDF. And, there's that the PDF pages are not formatted for the small screen of the Sony reader.
I did note that one of the reviewers posted instructions for using Convertlit to convert non-secured LIT files to HTML. Some of the comments mention using Calibre or the Amber ABC program and one commenter suggested that if anyone ran into problems, come to MobileRead.
The likelihood, however, is that the majority of recently-published romance novels will be in a secured format.