If you’re looking for a utility that’s more powerful than a text editor but is still light on your system then consider Nitro, a basic, free to-do lists manager that offers Dropbox and Ubuntu One Synchronization. Nitro also supports Smart Lists – lists based on self-defined criteria, easy editing and Quick Search. It’s clean interface makes it likable, Tagging is supported, like-wise Theming. Completed tasks go to rest at Logbook.
What else? Now that Ubuntu One has momentarily turned-off sync with Tomboy Note, you can turn Nitro into your favorite to-do list note taker. Sync is automatic, if you have a Ubuntu One or DropBox account. Nitro is also available to download for Mac OS X and the Chrome browser.