URL shortening is a great service, but some spammers use this kind of links in a nice way. URL Uncover is a web based service that helps you check how safe a link is without opening it. You need to just copy and paste the suspected URL, URL Uncover uncover ist mask and shows brief information of the original URL.
It works with McAfee SiteAdvisor to check if the domain is a trusted one or not. It is a useful service to put full stop to spammers and malicious script senders.