Simple plugin that checks your WordPress install and shows your file permissions, size, and last modified date.
Will add a little "x" next to any files/folders set to 777, since this is inherently insecure. Checks all recursive folders that come with a default WordPress install.
This plugin can be CPU intensive as it iterates over your whole folder/file structure to gather statistics.
This plugin will not return accurate results under IIS or WAMP stack due to how windows handles file permissions.