Polaris is a great little app for monitoring Google Analytics on your desktop. This is ideal for anyone who blogs or does web design as you can have the application running up on your screen w/out having to browse to the website.
It's very simple to install and get going (needs adobe air to run). Once you are setup you can click through a variety of reports that are standard for Google Analytics. Polaris is totally free for those that manage one site. If you manage more then one it costs $15 for multiple sites, definitely worth the investment.
For more info click here.