If you happen to be using a Nokia Lumia phone, you are in luck as Nokia provides the information as to the whereabouts your Tango update is. (Check your Nokia Lumia Update status here)
For the rest of the WP crowd, it's time to plug it into Zune Desktop or the WP7 Connector on the Mac and see if you have an update waiting for you (or you can just wait for the you have update prompt on your phone)
Among the bug fixes, the biggest feature Tango will bring is enhanced MMS and the long awaited WiFi Tethering or hotspot.
As of this moment, my factory unlocked Nokia Lumia 800 still have not received any update notifications yet.
... Yes, more on Windows Phone 7.8 a bit later.
