If you have been waiting for the public beta of Microsoft Office 2010 to open up, or waiting for the email inviting you, the wait is over.
Head on over to the Office 2010 Beta Page to sign up, get your key and download it. There are 32bit and 64bit versions on offer. I myself went for the 64bit version after having built a new computer with Windows 7 64bit on it!
With the beta, as in the previous Technical Previews, a small app will be installed which shows up in Add/Remove Programs or Programs and Features (depending on your version of Windows) called Microsoft Office Send-a-Smile. This will start up with Windows and display 2 emoticons in the system tray, near the clock, which you can click if you like or hate something. The app will then send a screenshot and allow you to add a comment regarding the feature that made you smile or frown. Please make use of this as it only serves to make Office better (depending on your comments) if the Office team get your feedback!
From the FAQ, the Beta will be active until October 31, 2010, so you have a good length of time to try it out and settle in.