From GARMIN Corporation:
Upgrading software for your Garmin GPS just got easier thanks to WebUpdater - Garmin's free new application that automatically detects and installs the most recent version of operating software for your compatible Garmin GPS.
WebUpdater's simple interface makes it easy to upgrade your operating software. Just connect your Garmin GPS to your computer, run WebUpdater, and follow the screen prompts. After confirming that you want to perform an update, WebUpdater will download that update for you and install it on your GPS. WebUpdater always checks for its own update first before performing a unit update. Unlike previous versions, you no longer need to download Web Updater everytime you upgrade your unit software. Once installed, simply run it from your computer - no need to download anything else yourself.