I had this extension installed in Chrome for awhile, PDFescape, but today was the first time I ‘ve really had a chance to look at it. It allows you to type on PDFs or create forms out of PDFs.

Once created, these PDFs can be filled out by students online through the PDFescape website, Apple Preview, or with the Adobe Acrobat Reader app on iOS devices (iPod touch/iPhone/iPad) or Android devices.