Remember the conficker virus that was stated to evolve itself on 1st April 2009? Now, it seems to be starting its work.
From Straits Times, it mentions that Cisco Systems Inc commented that the Conficker worm chich infect up to 12 million computers are sending out spam emails of about 10,000 to 20,000 a day per computer.
Also mentioned is that earlier in April, the computer infected by the Conficker worm started selling fake Antivirus software with popups and etc.
So, please remember to update your security patches and antivirus definition.
(source)