GOOGLE DESKTOP
http://desktop.google.com/
"Find your email, files, web history and chats instantly
View web pages you've seen, even when you're not online
Search as easily as you do on Google"
GMAIL DRIVE SHELL EXTENSION
http://www.viksoe.dk/code/gmail.htm
"GMail Drive is a Shell Namespace Extension that creates a virtual filesystem around your Google GMail account, allowing you to use GMail as a storage medium."
SPYWAREBLASTER
http://www.javacoolsoftware.com/spywareblaster.html
"Prevent spyware from installing in the first place!"
DVD IDENTIFIER
http://dvd.identifier.cdfreaks.com/
"DVD Identifier allows you to find out who really manufactured the media you are using."
ang uban.. i recommend.. (see above posts)
Azureus - bittorrent client
AVG - free antivirus
Winamp 5 - mp3 player + more
Firefox - alternative browser
dbPowerAmp - mp3 ripper