If you are looking for something to download then why not download the Windows 8 Developer Preview and have a taste of the next desktop OS from Microsoft. Keep in mind this is a pre-beta which means you should expect bug and instability. Recommended hardware is similar to what you should already using with either Vista or Windows 7:
Use the following links to download the version you find adequate: Windows Developer Preview with developer tools English, 64-bit (x64) 4.8GB SHA-1 Hash: 6FE9352FB59F6D0789AF35D1001BD4E4E81E42AF Download Windows Developer Preview with developer tools English, 64-bit (x64) 3.6GB Sha 1 hash - 6FE9352FB59F6D0789AF35D1001BD4E4E81E42AF Download Windows Developer Preview English, 32-bit (x86) 2.8GB SHA-1 Hash: 4E0698BBABE01ED27582C9FC16AD21C4422913CC Download Don’t forget to watch the Microsoft preview of Windows Server 8 @ 9am Pacific time, Sept. 14.
windows — Sep 14, 2011