Not quite sure if you've heard, but Microsoft launched a new mobile operating system today. Crazy, right? Unfortunately, it'll be a few weeks seasons still before you can actually wrap your palms around an actual Windows Phone 7 Series device, but the folks over at MSDN aren't holding back. They've hosted up a 22 minute video walkthrough to explain every nook and crannie of the fresh OS, and if you're one of those "impatient" types, you owe it to yourself to hit the source link and mash play. Grab a beverage first, though.