http://news.zdnet.com/2100-1009_22-6...ml?tag=nl.e550
...spammers are taking advantage of the YouTube function that lets people invite friends to view videos that they have viewed or posted. The function allows someone to e-mail any address from an account.
The scam on Google's video-sharing site is targeting Xbox owners, urging recipients to collect a prize version of the popular game Halo 3. Anstis said clicking on the link to "winhalo3" leads to a file containing a Storm trojan.
To date, Marshal has tracked around 150,000 of the spam e-mail messages thought to have originated from YouTube accounts.