Back on May 22nd we reported that the Google's Site Command Search Being Fixed, where searches in the syntax of site:www.example.com/ (trailing slash) and site: www.example-site.com (with a hyphen in the domain name) were not reporting the correct information back. Last week Google said they partially fixed it. They fixed the issue with domains with punctuation in them, so the second example listed above should now work. When using the site command, for now, just don't append a trailing slash to the URL.
Forum discussion at WebmasterWorld.