Following is the standard software for each operating system.
Additional software requires a special request.

Windows
Mac

Windows:

Operating System:
Microsoft Windows XP

Productivity:
Microsoft Office 2007

Browsers:
Internet Explorer
Firefox
Safari

Media Players:
Windows Media Player
Real Player
Quicktime
iTunes

Other Software:
Adobe Reader
Winzip

Email:
Thunderbird
Outlook

Podcast Creation:
Audacity

Mac:

Operating System:
Mac OSX 10.5 Leopard

Productivity:
Microsoft Office 2008 for Mac

Browsers:
Safari
Firefox
Media Players:
Real Player
Quicktime
iTunes

Other Software:
Adobe Reader
Stuff-it Expander

Email:
Thunderbird

Podcast Creation:
Gargage Band
Audacity

Other Multimedia Tools:
iMovie '08
iPhoto "08