What do you use to track visitors and figure out what works and what doesn't and if your marketing is paying off? Is there something you wish was out there as a service but isn't? Are you concerned about privacy regarding analytics data? Are you currently paying for something similar to Google Analytics?
I'm using piwik ( http://piwik.org) Reason: I don't want to have important data saved on 3rd parties. Specially google is "dangerous" and what would you do, if they decide to shut it down on their next cleanup?