Logbook by Transmissions: 37signals companion apps for the Mac.
Some of you who follow my musings elsewhere may know that the idea of a Daily Log has been on my mind a bit lately. If you have a Backpack account, the Journal feature is an easy way to keep a record of what you are working on. Logbook aims to make that even easier by putting a handy way to update the Journal in your Mac OS X menubar. Seems really elegantly designed.