(Inside Adsense) On your Reports Overview page, click on the dropdown menu for reporting dates to see this option listed. If you haven't yet received your first payment, it appears in the dropdown menu as 'all time'.
If you already have, it shows up as 'since last payment'. Now you can easily see how close you are to hitting the $100 mark!
So for those of you who do not have Google Ad Sense, now is the time to GET IT!! Why you ask? Because it works!