Version 1.9 of bCards can now store the reverse sides of business cards. In the past it was limited to the front of the cards only.
To try this out first edit a card entry. On the Edit screen show the Options Menu and select "Change Back Image". See below.
After taking a picture of the back of the business card, save the card entry in bCards by pressing the Save button.
In the Thumbnail, List or Gallery view open the Options Menu and select "Flip Card" to see switch between the front and back images.