Drafts is a fast, lightweight note-taking app for iPhone (US$2.99) and iPad ($3.99) with so much more to offer than simple lists. Drafts is handy. You can use it to quickly jot down a list or something you'd like to recall later, which is great. But the app's real power is in the myriad of ways you can act on that text.
For example, you can send a list to a project manager like OmniFocus or a storage service like Evernote. Share a note with Facebook, Twitter or ADN. Create a calendar event, a reminder or even write in Markdown. Beyond that you can really