BC,
When do you think the results of your experiment will be posted and where can we find them, I would enjoy reading what your findings were.
well, step one will be getting off my but and doing it.
I'm still hashing out the details, since really, I'm trying to effectively separate three kinds of registry cleaners- those are are completely illegitimate and do absolutely nothing at all, those that are legitimate but are "renegade" when it comes to what to clean, and "careful" cleaners, of which I think CCleaner will fall under, that generally only example COM component classes, which only can cause issues in certain circumstances involving networks and removable drives.
But when I finally do it, it will be on my blog pages, accessible via my recently redesigned web page,
http://bc-programming.com/.