Harry Waldron - Corporate Security News

TinyURLs allow a lengthly URL to be abbreviated. They are being used by malware writers to make links appear less suspicious. Always be careful with any link you click on, as malware can be automatically downloaded from a malicious website to vulnerable systems.

TinyURL usage becoming more common in Phishing and IM Attacks
http://blog.trendmicro.com/tinyurl-phishing-becoming-popular/
http://blog.trendmicro.com/tinyurl-now-used-in-im-phishing/

QUOTE: As TinyURLs become more and more popular, phishers are also exploiting the URL shortening service this said tool provides. They do this make phishing URLs less suspicious and less obvious than using the exact URL, which could be long and totally unrelated to the site a spammed message purports to be from.