Watch Apple's entire WWDC 2011 keynote, as well as the iOS 5 Preview
The company announced major milestones in its chief software products - Mac OS X Lion for the desktop, iOS 5 for its mobile devices, and iCloud, its revamped online storage and syncing service.
Mac OS X Lion is starting to look more and more like iOS, while the mobile operating system itself seems to be seamlessly blended into iCloud, showing the level of integration Apple is heading towards across all of its device categories.
Both videos in the source link are worth watching, be it only for Steve Jobs's appearance, or for visualizing the new notification system, and, as usual, the videos are not embeddable, just make sure you have Quicktime installed if you are on a Windows machine.
source: Apple (WWDC keynote & iOS 5 Preview)