Grading Apps

I was using my computer to show something to the kiddos the other day and I needed to grade some papers while they were working.  Since I couldn't use my regular Fuel the Brain grader (which I LOVE!), I realized that I had never used my iPhone or iPad for grading. Really?!?
See below for some really simple apps for grading! 
Grade It!
Quick Grader
Groovy Grader (I think I like this one just because of the name! :)
eGrader