By now, most people have figured out that Etsy and ArtFire have added a Google Analytics feature for us sellers. If you haven't figured it out yet I've written a tutorial for you!
Step 1: Visit http://google.com/analytics and sign up for an account or log into your existing account.
Step 2: I already have a few accounts set up so it might be a little bit different for you. Click on "Add Website Profile". In the URL area and enter your Etsy or ArtFire address www.yourshop.etsy.com or www.yourshop.artfire.com, set your location, time and hit "finish". If they ask for your shop name type in www.yourshop.etsy.com or www.yourshop.artfire.com which ever is appropriate for the account you are setting up. (Do NOT include the http:// in the URL)
Step 3: When you are on the Tracking Code page just scroll to the bottom and hit finish you don't need this code.
Step 4: On the next page you will see a grey table with your website URL. Next to the URL should be a code that looks like UA-1234567-8 copy that code (Ctrl + C).
Step 5: For Etsy go here http://www.etsy.com/shop_analytics.php or your "Studio Stats" if you are on ArtFire and paste (Ctrl + V) the code in the designated area and save changes.
Step 6: Now you're finished setting up Google Analytics! If you look at the Overview page in Google Analytics you will see that there is a yellow symbol with an exclamation mark on it under the status column. When it turns into a green check mark then you can start viewing your stats. (It can take up to 24 hours for the stats counter to update).