Knuckles suggested a trojans-viruses forum in one of the other threads. I say: let's make it a thread

Anti-virus software:

Symantec
Sophos
Trend Micro
AVG
F-Secure
McAfee
ThunderByte
Panda
Kaspersky

On-line virus scanning:

Trend Micro
McAfee

Hoaxes:

F-Secure
Panda

Trojan detection:

Tauscan
Moosoft

Hope this helped... Feel free to add your own...