Hm... does coinurl actually contain malware, or is this an unethical business practice by google ? The ads sported by coinurl looks much like google adsense ads, but if Google is using their power to give warnings to all users on any site incorporating coinurl, that's really really bad, and evil.
I would think that could even be grounds for a lawsuit, if it's not really malware, but malicious blocking.
The site is now also blocked in firefox, with some more info here:
http://safebrowsing.clients.google.com/safebrowsing/diagnostic?hl=en-US&site=http://coinurl.com/So, legit malware ?