Heard Ian talk at my school for a leader conference recently and he was telling us about randomaok. Just wanted to share a couple things that I've done for others.
I'm a huge fan of books and spend way too much time and money in Chapters. One day, after spending 4 hours walking around in the store and browsing, I decided to purchase the books that reminded me of anyone I knew. I ended up with 8 books and wrapped them in brown paper and left them in everyone's mailbox in our office. One of them even wrote me a really nice thank you letter that he posted in the office. It felt pretty good. :)
When I'm heading home from campus, I also always leave my parking ticket in the machine for the next person so they don't have to pay for parking.
I'm so glad to have discovered this site! The cards are a great idea.