Google Maps plugin for Address Book.
Organize your thoughts, remember things and generate new ideas.
Perform algebraic operations in a calculator that stays on top of other windows.
transfer files to and from Bluetooth cell phones
Figure how much to save each month to reach your financial goal.
categorized sticky notes
JavaScriptable tool for jobs that are too small for spreadsheets but too big for calculators.
Sticky notes for the desktop with password protection.
Focus timer and goal tracker for work and study.
Add a handful more trackpad gestures to your Mac, and tie them to a custom action.
Work out the compound interest on your savings.