Radar is a native Mac app that notifies you of updates to your Basecamp account.
It's easy to get distracted. Radar enables you to concentrate on your work without needing to login to Basecamp all the time to check for updates.
Radar checks for updates on a time interval that you set. Radar also launches when you login to your Mac and updates itself as well, so once you've setup your account information, you can get to work.
Radar includes Growl support.