Phonealytics, the highly rated Google Analytics client for Windows Phone 7, now has a free version. Normally setting one back by £1.49 ($1.99), the free version of the app boasts all the features you'd expect, minus live tile support.
We recently interviewed the developer of Phonealytics, Luke Lowrey, to get his view on WP7 development and the platform itself. We also have a how to for the live tile support should you have trouble with setting it up. You can download Phonealytics for free (or the paid version) from the Marketplace. They're separate apps, the free version isn't a trial of the paid.