Great replies, everyone! Here are the winners of this contest, chosen based on their originality and diversity. I wish I could choose more, but there were only so many codes.
First Winner: wipednwired
"I'm a university teacher, and need a portable and up to date way to grade papers on the move. My students already submit then electronically. I would use iannotate to make marginal comments with a stylus, highlight common grammar mistakes, add URLs to direct them to websites for further help, and to type longer comments at the end."
Second Winner: rajagopalanator
"I'm currently a junior economics major… who would love the chance to try iAnnotate to replace my note-taking workflows, which entail PDF annotation through Adobe PDF for some classes, typing up notes in LaTeX in others, and handwriting/using Word's journal for others… [A]s an econ major, professors almost always give us slides that need a lot of annotation, so iAnnotate seems to fit this niche perfectly."
Third Winner: ebk5
"I am a medical resident and have hundreds of PDF's of medical articles/publications that I review for work and educational purposes. It would be awesome to use an app that would allow me to annotate the articles so that I can review the important points of each article when I revisit them."
Fourth Winner: skimonkey
"I would love to try iAnnotate to help me annotate research articles for work. My responsibilities at work involve quite a bit of clinical research which directly requires a lot of reading. We are currently working on best practices in our Health System pertaining to patient outcomes. Being able to annotate articles and share with my co-workers would be very helpful."
Fifth Winner: Layth
"As an aspiring filmmaker I frequently work with and share large PDF files. While so far I found my iPad great at reading PDF files just as comfortably as printing them out (without the killing trees part!). Annotating them has been a challenge so far."
Note to winners: if you didn't add your email address into the message, please check your private messages for the promo code.