I installed WP-Super-Cache but couldn't get it to work. I had the same problem with the Mod Rewrite as here. Anyway, I figure WP-Cache will be enough for my needs. So I set about uninstalling. All went fine but I cannot remove the cache folder. I chmod it to 777 but permission is denied - the owner/group is httpd and this might be the problem. I had the same problem with the advanced-cache.php (folder-looking file) but moving it into another folder and then deleting that folder (of which I was the owner/group) worked. This approach does not work with the cache folder since I do not have permission to move it. I even backed up my wp-content folder, without the rogue cache folder, and tried to delete the wp-content folder on the server. Of course everything else deleted except the cache folder!
Any help on how I can remove this dang folder is much appreciated!