Ask HN: Any Design Tips for my First iPhone App?

Link to my app: http://itunes.apple.com/us/app/101-grads/id426288442?mt=8&ls=1

(The app is basically a list of 101 things to do before graduating college, I did not provide the content)

I made this app about a month ago and was recently hired by a company to make an app that has similar functionality. My question is, what design tips do you have? I have no experience with design and wanted to get it right. Any thoughts/suggestions would be appreciated.