Windows 7, the new version of the Windows OS is released in Beta stage and people are in such a big run for the download, that Microsoft has pulled out the download links of the beta version.
But still, the links for download are all spread everywhere and you too can download the Beta version of Windows 7 from the links shared below.

Accd. to Microsoft,

Windows 7 is the next release of the Windows client operating system, built on the secure foundation of Windows Vista and Windows Server 2008. Performance, reliability, security, and compatibility are core tenets of this release as we collect your feedback to meet our engineering goals of making Windows 7 the best-performing and most stable Windows operating system to date. New innovations in the product are designed to augment your ability as an IT professional to better provision and manage increasingly mobile PCs, protect data, and improve both end-user and personal productivity.

Here are the download links for Windows 7 Beta. There is no affiliation, so you would be directly taken to the Microsoft website download file and it will open the dialog box to confirm your download -

Download Windows 7 Beta 32 Bit
Download Windows 7 Beta 64 Bit