This list is frequently updated 
NEW PROMOTIONAL OFFERS Another Free 6 Months KAV 2009 License from Kaspersky Poland for CHIP Readers Guaranteed and Immediate Free KAV 2009 License Key Valid for 183 Days Norton 360 2.0 and Norton 2009 AV trial for 90 days (3 months) Free Anti-Virus Software Avast Home Edition Avira AntiVir Personal BitDefender Free Edition Grisoft AVG Free Rising Antivirus Free Edition Free Antispyware SpyBot - Search & Destroy Ad-Aware 2008 Windows Defender Spyware Terminator Spyware Blaster Shareware Anti-Virus Software Kaspersky Anti-Virus 2009 Kaspersky Internet Security Suite 2009 Norton 2009 Norton 360 v2 ESET NOD32 BitDefender Antivirus 2008 Free Anti-Virus Bootable Rescue CDs Hiren's Boot CD 9.6 Kaspersky Rescue Disk BitDefender 2008 RescueCD v2 Avira AntiVir Rescue System F-Secure Rescue CD 3.00 Removal Tools for specific Virus, Worms, Trojan variants. Kaspersky Malware Removal Tools Symantec Security Response - Removal Tools BitDefender Virus Removal Tools McAfee Virus Removal Tools F-Secure Virus Removal Tools Avast Virus Removal Tools Grisoft AVG Virus Removal Avira AntiVir Removal Tool Piyush Labs Other Damn Useful Tools RegSwitch , TaskmgrSwitch , cmdSwitch Scripts Kaspersky AVP Tool - Remove most common virus infection and this tool is very effective
Flash Disinfector - remove most common flash malware from removable drive
CaSIR - remove most common infections
Autoruns - msconfig alternative, monitor startup entries in registry
FileAssasin - Delete files that are undeletable
Malwarebytes Anti-Malware - Remove common malware and rogue softwares
Process Explorer - Task Manager replacement
System Shutdown Simulator - Test whether AV effectiveness
BHO Remover - Remove Browser Helper Objects from IE
CW Shredder - Remove the popular spyware/adware Cool.Web.Search
TrendMicro RUBotted - check wether your pc is a bot or zombie controlled by hackers
HijackThis WinPatrol NetShare Monitor - Monitor which folders are shared over network ( including through netbios )
RRT - Restriction Remover Tool, fix registry settings modified by viruses
ESET SysInspector MSNFix - Remove MSN viruses
FreeFix - Fix common spyware and adware
AIMFix - Remove AOL instant messenger viruses
ProcNet Monitor - Monitor which process is accessing which IP address over tcp
RemoteDLL - Inject or remove dll from processes
Tiny Watcher - Monitor changes to folders/files
SandBoxie - Run programs in isolated environment
RogueRemover Remove Brontok - Several effective tools to remove brontok infection
VirusTotal Uploader - Upload suspected file to VirusTotal by rightclicking
VundoFix - Effective remover for Vundo infection
Brontok Washer - Remove Brontok infections
McAfee Avert Stinger RegAlyzer - Edit registry
FileMon - find what app is accessing your hdd
GS - cmd replacement
FingerPrint - monitor changes in files and folders
Kiwi Application Monitor - lets you monitor your applications/processes
Spy-The-Spy - monitor folders for exe or dll being added, renamed or modified
Syslog - An on-demand windows system folder monitoring tool
Protection and removal for pendrive viruses: USB Antivirus Mx One USB Firewall iKill USBVirusScan Flash Disinfector Online Scanners Free 12 Online Scanners from various AVs Online Multiple Scanners VirusTotal - Upload and scan a file by 36 AVs !
ThreatExpert - Upload and analyze files, the areas they affect and their behavior
Please report
broken links.
And guys please say if I missed anything important.