Spark is a very lightweight notes taking / to-do list app, which you could run either in the dock or in the menubar.

Spark is a Simple Yet Powerful Task Management app. Some of Sparks features include:

- Projects; Group your tasks into projects so it doesn't clutter your to-do list.
- Global Shortcut; Spark can be accessed anytime, anywhere by just pressing a simple key board shortcut that you can choose.
- In your MenuBar; Spark can sit in your menubar and not in your Dock so as to keep your Dock clean and tidy.
- Sync with iCal; Spark will sync automatically with iCal when any tasks in Spark change. Never leave iCal in the dark!
- Due Dates; Never forget when your task should be completed! Don't want to use Due Dates just hide the Due Dates bar.

Review from MacStories.

> "Spark is freeware, it has a clean and well-designed UI and it could become the ultimate solution for those who are looking for a simple, uncluttered to-do manager app for Mac."