I like to gather as much evidence as possible of my students demonstrating what they have learned in class. I frequently do this by taking pictures of their work with my iPhone or iPad or by having the student take a screenshot and sending it to me via AirDrop. These pictures and screenshots then become my students' portfolios of their learning and achievement. Workflow makes the process of getting the pictures, naming them, and putting them into the a student's file simple and easy. I then use these portfolios to show parents examples of their child's work. I also use them for my own personal reflection and consideration when assigning grades and guiding future instruction.
Workflow link: Create student portfolios - Evernote