You can also find this list on my main blog - Vista compatible freeware - which is updated very often.

Audio and Video and Image

• FastStone Capture (freeware version) - Screenshot capture
• FastStone Image Viewer
• Picasa
• ImgConverter
• Firm Tools Shell Extension Converter
• Image ReSizer
• The GIMP
• Blender 2.44
• Paint.NET
• Corel Snipefire 1.2 - Image organizer, editor and viewer
• Acala Video MP3 Ripper

• Mega Sound Recorder - Sound recording
• EXPStudio Audio Editor Free - Audio editor
• Audacity
• GOM Player
• OrangeCD Player
• Ashampoo Clip Finder
• FinalBurner - Burning tool
• ImgBurn Burning tool

• DVDFlick
• Dvd Decrypter 3.5
• Dvd Shrink 3.2

  more…

Best Free Antivirus

• AVG free (antivirus)*****
• Avast (antivirus)****
• Bitdefender 8 Free Edition (antivirus)
• ClamWin Free AntiVirus 0.88
• Comodo AntiVirus
• AntiVir PersonalEdition

Miscellaneous

• GRC Shields Up (scans for open ports)
• AirDefense Personal Lite
• All-in-One Secretmaker

Best Online Antivirus and AntiSpyware scanners

• BitDefender Free Online Virus Scan (requires ActiveX)
• Computer Associates eTrust Antivirus Web Scanner
• Freedom Online Virus Check
• F-Secure Online Virus Scanner
• Kaspersky Online Scanner (scanner requires ActiveX)
• McAfee FreeScan
• Panda ActiveScan
• RAV Antivirus (scans a file)
• Symantec security and virus checks (scanner requires ActiveX)
• Trend Micro HouseCall (requires use of a setup program for Netscape browsers)
• Virus Total (scans a file)
• Pc Pitstop *****