Macromedia has a ColdFusion Feature Comparison Matrix that compares features for each version of CF from 5 to the newly released 7. It’s not as handy as a tag/function listing across all the versions would be, but it does show how the platform has progressed over the last few years. By the way, I wouldn’t try and print it, it’s flashpaper, and the memory usage of printing from Flashpaper is likely to crash your machine, or at the very least saturate your network interface for a good ten seconds.