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Software
FireFox - Everyone's favorite anti-microsft web browser
Mozilla Thunderbird E-mail Client - A good replacement for Outlook Express
Trillin IM Client

Drivers
ATI Driver
Nvidia Driver
Microsoft .net 3.0 Re-distributable

Utilites
Windows 7 Login Background Changer
NLite
- Deployment Tool for the Bootable Unattended Windows ISO (Remove components, integrate hotfixes, drivers and themes. Tweaks, patches...)
Free AVG Antivirus / Anti Spyware - This is a really good free anti virus utility
CPU-Z 1.46 - a freeware that gathers information on some of the main devices of your system.
Daemon Tools Lite - DAEMON Tools is an advanced application for Microsoft Windows which provides one of the best optical media emulation in the industry. DAEMON Tools enables you to use your CD/DVD images as if they were already burned to CD/DVD.
Zone Alarm Firewall
Spybot Search and Destroy - Application to scan for spyware, adware, hijackers and other malicious software. Spybot Addons
Ad Aware 2008 - Anti-Spyware Utility
WinRAR
i3kfan - Fan control for Dell Notebooks

Benchmark Utilities
3D Mark Vantage
3D Mark 2006
SiSoft Sandra
Super Pi

Linux Distros
Ubuntu
Kanotix
Fedora

Distributed Computing Clients
Boinc Multi OS - This page will detect your OS and give you a link to the approiate version, next check out the Boinc Tutorial for info on setting up boinc for the first time.