Andrew Lampert points out more RSS exponential trends:

"TechCrunch is reporting on the recently released Feedburner statistics that show the growth of Feedburner subscribers and managed feeds over the last 18 months. Both show clearly exponential trends - the number of feed subscribers appears to be doubling about every two months (or even faster in some cases)! The number of managed feeds has increased by more than an order of magnitude over the past year."