This is not the first time ASUS Taiwan has been hacked and infected users. There was another incident back in December last year that I wrote about:

http://msmvps.com/blogs/spywaresucks/archive/2006/12/16/425879.aspx

As far as I know, the earliest report about the current ASUS hacking was back on 3 April - Lars Nelson commented to Susan Bradley's blog and we were able to independently confirm the hacking:

http://msmvps.com/blogs/spywaresucks/archive/2007/04/04/749633.aspx

3 primary attack vectors: Microsoft Internet Exploder, Microsoft Outbreak, Microsoft Windows. Common problem: Microsoft. Popular remedy: Linux.