How about a video resource library? If you've got the cash, you can work with people who are experts on particular topics (email marketing, etc...) to prove you the tutorials. Alternatively, you can block out a weekend to put some videos together. It's acts as a marketing tool, ("Learn Everything You Need to Succeed With Daily Deals!") and a retention tool. In fact, having a big link to the video library on the cancel page would probably distract people away from cancelling.