Google Analytics experienced huge demand since its rebranding coupled with giving away the web analytics service for free. Since then, it had to stop accepting any new signups and data collection is taking several days while they upgrade their capacity.
For those running Adsense on their sites, they can now track clicks in Firefox and IE with this free adsense tracking code that works with Google Analytics courtesy of Aaron Wall. It accomplishes tracking via the definition of Goals.
Because testing is prohibited under Google’s guidelines as a publisher, you’ll just have to wait for results to come in to determine whether you have it correctly installed.