I've been using the new CloudFlare control panel for the last few weeks, and took a closer look at some of the new information on it last night.
It seems that for free domains they now plan to limit the number of records that you can enable the reverse proxy on.
I suppose that 9 is a fair amount for most domains, and it won't be affecting any of my free domains, as far as I can see, but just a heads up!
Edit: Or, just ignore that, as it's the total amount of records - purely a stat. Whoops.