Listbook
Listbook, by noidentity, is an iPhone app to manage lists, like groceries and todos. What is so special about it though is that it is to lists what Reeder is to RSS.
It is in the App Store for just $0.99.
Update: Err, in the end I’m not using Listbook. It requires too much taps to add a new item, and I’m better off using my Moleskine for this.