Here we are folks! This is it, a Mango beta ROM (reportedly build 7661) is now available (or will be shortly) for developers to update on their retail devices. Fantastic news for the registered brains. Confirmation comes from both Brandon Watson and Joe Belfiore. Full distribution of Mango to developers will be carried out over the next few weeks (in batches), registered developers will receive invites to the Microsoft Connect site, which will provide you with the update.

Countries explicitly supported for the early access program (your device will be supported by big M and will be processed should it malfunction once the distribution infrastructure is in place):

 "Australia, Austria, Belgium, Brazil, Canada, Denmark, Finland, France, Germany, Great Britain, Greece, Ireland, Italy, Luxembourg, Mexico, Netherlands, New Zealand, Norway, Portugal, Spain, Sweden, Switzerland, United States"

What should you do now? Why not head on over to download the Mango Tools beta 2, which includes a number of  goodies, update your device to Mango and then (as Brandon Watson so fantastically puts it):

"Third, go rub it in your friends’ faces that you have Mango and they don’t. "

There will be a tools update in the coming months that will feature the go-live license required to publish Mango apps to the Marketplace, but be sure to start being creative now since your apps will work in the tools and the developer phone. For more information, check out the official blog post using the link below. These are positive signs my friends, this will surely drive excitement for Mango even further.

Source: WindowsTeam Blog