ScanURL is a site that will check a URL (web address or domain) and see if it has been reported for phishing, malware, viruses or a poor reputation. It uses multiple 3rd party services, including Google Safe Browsing Diagnostic to scan the websites and report back to you.
This is a great tool to check web sites before you visit them, especially if you are unsure about them. It's also a great tool to share with others to help them protect themselves from malicious web sites.
Here's the report for this blog site: (nice and safe)