I use Google Analytics. It keeps track of all sorts of goodies for me. The thing I like the most and really appreciate is the visitor tracking. I like knowing how many people visit my site on a regular basis. I don’t use much outside those base features, though. Good thing there’s an app for that.
There’s a sick little iPhone and OS X app called GAget. It’s sole purpose is to provide you with just-the-meat of your Google Analytics data including visitor sessions, bounce rate, new visitor percentage, and visit length. On iOS, this comes in the form of a super clean app that you can scroll though. On OS X, it’s a notification center widget. Both are super sexy.