Expense-management startup Expensify announced a new feature that allows the user to 

crop and rotate receipts. 

The functionality is simple: 

1) In the Edit dialog, select Rotate/Crop

2) Adjust the image as needed

3) Save the image

Made a mistake? It even allows users to undo changes to receipts by restoring the original copies.

For more information, see Expensify’s FinovateSpring 2011 demo here.