It's official: Flickr has announced that it's launching an officially official Flickr app for Windows 7 and Windows Phone 7. Though we don't know exactly when the photo sharing apps will launch, you can sign up at the source link on Flickr so they can let you know when it actually launches. In the meantime, there's a video demo of the apps in action, and we have to say, we like what we're seeing.

Dell Streak 7 first hands-on! (update: more video)