Originally Posted by LoganK
So far there is not. It may be possible to re-download the books in Adobe Digital Editions format when the Sony store switches, though.
The free books offered by Google on the Sony Store (under unearth a classic) are in EPUB and PDF. If you can find where the Sony Store saves the books on your computer and if they are .epud or .pdf you can just copy and pate them onto your SD card or reader. This will only work with the free books.
I was also under the impression that the Sony Store was already selling ADE EPUB files and has been for some time.