Do I need anti virus software?

Seems to me that;

"Macintosh girl in a Microsoft world"

stated it quite succinctly;

"It's not fully clear yet all of what's going on"

and if that was the case in 2006 will there be any more clarity in 2010.

I actually think you came on here to start an argument about Windows and Macs, excuse me for having an opinion though.

I actually downloaded that file in the last link, and as described, terminal starts running something, and shuts down, it has been 7 hours since download, and nothing, there is no way that is a viri.

May I also mention it never did ask for admin password.

If you ask me it's a trojan, and on Macs, it can not spread itself unless I deliberately spread it.