I used the "QR Treasure Hunt" found at http://classtools.net/QR/create.php to create a review for my students. Entering the data is pretty easy and the directions are well written on the page. However, I added a twist by creating a clue on where the next QR code could be found.
Example: Which freedom IS NOT included in the 1st Amendment-press, speech, religion, bear arms, assembly, or petition? Next question just keep swimming.
In this example, they would go to our fish pond and scan the code there. Sometimes, they had more trouble on "where" to find the next code instead of the content, lol. They told me that I was being too clever with my clues.
The students like it because they are moving around, getting to use their device (smart phone, ipod touch, or ipad), and working together.
The first time I did it, they were restricted to my classroom and right outside my classroom door. I told them it was their "test" to show me they could handle a larger area. Guess what, they did it! The second time they got to go in our team area and media center which was a pretty big area.
I'm considering going to more common areas next time. Also, to make sure they don't "cheat" and just scan codes, I may have them "map" their path which would be a great way to reinforce map skills.
Clipboards were helpful, if you have a set. I also created a simple answer sheet. I would say 95% of my students were engaged and asked to do it again.
Feel free to ask any questions.