There may even be adapters available that will fit into a SD card slot and accept a CF card. I know for a fact that there are adapters that fit into a CF card slot and accommodate a SD card. -----Original Message----- From: bookport-bounce@xxxxxxxxxxxxx [mailto:bookport-bounce@xxxxxxxxxxxxx] On Behalf Of Sandy Licht Sent: Sunday, July 15, 2007 12:33 AM To: bookport@xxxxxxxxxxxxx Subject: [bookport] Re: Batteries current vs. future Book Port The SD card is a lot smaller. There is no way to interchange them with CF cards. But with two Bookports, you would never run out of reading material. I am not suggesting you could read the same book on the old Bookport that you were reading on the BP2. I am just suggesting you keep the old one as a spare. Personally, I like the idea of rechargeable batteries, but that is an individual preference.