One of the more common requests for an app suggestion that I get around school is for a PDF-editing app: annotating, editing, filling out forms, etc. There are a couple of good options, and I've tried a few of them.
The Sweet Setup goes through the pros and cons of the most common apps, and makes a recommendation. It's a thorough review, and one they have done for several categories, if you're interested.
Education Technology Blog - A resource designed for staff at Regis Jesuit High School in Aurora, CO.
