Following the earlier “unofficial” way of getting Marketplace on your 6.0 and 6.1 devices, the full official way is now here or just type “mp.windowsphone.com” into your Windows 6.0 / 6.1 IE browser.
Once done, you’ll be able to browse and install the new Windows Mobile application store and grab apps and games direct.
Links – microsoft.com/windowsmobile – mp.windowsphone.com