Boris,
Google Reader (
http://www.google.com/reader/) - This lets me organize and stay on top of tons of feeds
Firefox (cue astro's list of extensions)
Trillian (instant messaging) (
http://www.ceruleanstudios.com/) - I like the ability to have multiple accounts open in one client across Yahoo, AIM, and MSN.
AVG Anti-spyware/anti-virus (
http://www.grisoft.com/) free and pay versions. free home use version is great.
OpenVPN - For anyone who needs to set up a VPN to the office or wherever, this is super easy to setup and use.