Anti-Virus Utilities on linux/ubuntu

[NoOp]

There have been long & hard threads the past on whether having an AV
utility installed in Ubuntu is worthwhile or not; I'll not go into any
of the whys/whynot's, but instead offer a real case example where it's
helped me just recently.

My son's laptop motherboard bit the dust recently. He'd been running
WindowsXP on it & asked if I could check to see if his music could be
salvaged. I picked up the laptop yesterday and put his hard drive in
another laptop; fired up Knoppix, verified that the drive was good,
proceeded to copy his 6.3Gb of music files over to a spare drive, and
then happily burned the files onto two DVD's last night.
  This morning (having a clearer head & realizing the files came from a
Windows drive and, that he was going to copy the files back onto his new
Toshiba laptop w/Vista)[1], I decided to run Bitdefender (linux version)
on the DVD's. What do you know; 7 trojaned .mp3 music files in the bunch
with:
Trojan.Downloader.WMA.Wimad.S and Trojan.Downloader.WMA.Wimad.Z.

To make a long story short; shreded the DVD's, used Bitdefender to scan
and clean the drive (via samba no less to the Knoppix: just had
Bitdefender connect to the .gvfs samba mounted drive ), reburned the
uninfected music & his document files, etc., and now I feel comfortable
enough to give the resulting DVD's to him to load onto his new laptop.

So dear readers, as I've said in the past, there is indeed a good reason
to keep a good linux based AV utility around...

[1] He has reason to run Windows on his laptop... his wife on the other
hand is a bit smarter & *only* runs Ubuntu on her desktop machine :-)