As promised, Microsoft has released the Windows 10 Technical Preview and you can download it now by hitting the source link at the bottom of this post.
The OS, which is designed to give you a small flavor of what will be included in the final release of Windows 10, is still an early build. The build number for this release of the OS is 9841 and we know for a fact that later builds are currently floating around inside the walls of Microsoft.
As with any non-commercial release, you should not install this OS on production hardware as there could be bugs that make some software not work as intended. If you have the ability, installing this OS inside a virtual machine is the safest option and if you can't do that, we suggest you designate an older machine as a testing device and install Windows 10 on it.
Once you do have the OS installed, if you have any questions or want to talk to other users who have the bits on their machines, make sure to head into the forums and post your question (or help out those who are having trouble with the OS.