Download the Beta version of Windows 7
This is the best released OS ever with amazing features like auto-hide of windows, improved taskbar & many up gradation to IE 8 & windows live.
You can download the Beta version from this link:
Remember that this version is only for testing purpose & will work until August 2009. So get your hands on this brand new release from Microsoft. Just chose your processor & download.
Note: Post your request for softwares in comments.